# Quickstart for Web and Tablet App

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1 Quickstart for Web and Tablet App What is GeoGebra? Dynamic Mathematic Software in one easy-to-use package For learning and teaching at all levels of education Joins interactive 2D and 3D geometry, algebra, tables, graphing, calculus and statistics Open source software, freely available from Quick Facts GeoGebra facilitates the creation of mathematical constructions and models by students. It allows interactive explorations by dragging objects and changing parameters. GeoGebra is also an authoring tool for teachers to create interactive worksheets. Find free classroom materials and share your own on Getting Started After starting the Web or Tablet App of GeoGebra you will first see the Perspectives Start Screen. Select the GeoGebra Perspective that best fits the mathematical topic you want to work with (e.g. Geometry, Algebra, Statistics). Please note that you can switch between Perspectives at any time using the Perspectives menu. GeoGebra Quickstart, Version

3 Example 1: Circumcircle of a Triangle Task: Construct a triangle A, B, C and its circumcircle using GeoGebra. Preparations Open the GeoGebra Web or Tablet App and select the Geometry Perspective from the Perspectives Start Screen. Familiarize yourself with the tools provided in the Graphics View Toolbar. Hint: You can open a toolbox by tapping on one of the default tools. Construction Steps Choose the tool Polygon from the Toolbar. Now counterclockwisely tap three times on the Graphics View to create the vertices A, B, and C. Close the triangle by tapping on point A again. Select the tool Perpendicular Bisector and construct two line bisectors by consecutively tapping on two sides of the triangle. Hint: If a tool is not displayed in the Toolbar by default, you may want to look for it in the toolboxes. Using the tool Intersect you can successively tap on the line bisectors to create the center of your triangle s circumcircle. Hint: By default, the intersection point is named D. Select the tool Circle with Center through Point. Tap first on the center point D, then on any vertex of the triangle to create the circumcircle. Using the Move tool you can now use your finger to drag the triangle vertices - your construction will change dynamically while you move them. Hint: In order to move the whole construction within the Graphics View, select the tool Move Graphics View and simply drag it around. GeoGebra Quickstart, Version

4 Hints Try the Undo / Redo buttons on the right side of the Toolbar. Use the Show / Hide Object tool from the Graphics View Toolbar in order to hide an object. Using this tool, select all objects you would like to hide. Then, switch to another tool in order to apply your changes. You can change the appearance of objects (e.g. change color or line style, show / hide labels) easily using the Style Bar. Select the object you want to enhance and tap the Style Bar Button in the upper right corner of the Graphics View in order to open the Style Bar. You can also show / hide axes and a grid using the Style Bar. Tap on the white background of the Graphics View to make sure that no object is selected. Then, tap the Style Bar Button in the upper right corner of the Graphics View in order to open the Style Bar. Example 2: Parameters of a Linear Equation Task: Use sliders to dynamically change the parameters of a linear equation. Preparations Open the GeoGebra Web or Tablet App and select the Algebra Perspective from the Perspectives Start Screen. OR Tap on the Menu button on the top right corner of the GeoGebra window and select New from the File menu. Then select the Algebra Perspective from the Perspectives Start Screen. GeoGebra Quickstart, Version

5 Construction Steps Enter y = 0.8 * x into the Input Field in the Algebra View 1 and hit the Enter key. Exploration: Which parameters can be changed when you modify 2 the line in the Graphics View by using your finger to drag the line? In the Graphics View, use the Delete tool in order to delete the 3 line. Hint: You need to open a toolbox in order to select this tool. Use the Slider tool in order to create two sliders a and b using the 4 default settings of sliders. Hint: After tapping on the Graphics View, a window appears allowing you to specify the parameters of your slider. Tap Apply in order to close the window and create a slider. 5 Enter y = a * x + b in the Algebra View and hit the Enter key. Select tool Intersect from the Graphics View Toolbar in order to 6 create the intersection point A between the line and the y-axis. Use the Point on Object tool in order to create a point B at the 7 origin. Use the Segment tool in order to create a segment between 8 points A and B. 9 Use the Slope tool in order to create a slope (triangle) of the line. Hint You might want to enhance the appearance of your construction using the Style Bar (e.g. increase the line thickness of the segment to make it visible on top of the y-axis, show the slope's value instead of its name). Select the object you want to enhance and then tap on the Style Bar Button in the upper right corner of the Graphics View in order to open the Style Bar. GeoGebra Quickstart, Version

6 Example 3: Intersection of Polynomial Functions Task: Explore how a parabola can be intersected with a linear function by determining the roots of their difference function. Preparations Open the GeoGebra Web or Tablet App and select the CAS Perspective from the Perspectives Start Screen. OR Tap on the Menu button on the top right corner of the GeoGebra window and select New from the File menu. Then select the CAS Perspective from the Perspectives Start Screen. Construction Steps In the CAS View, create a quadratic polynomial by entering f(x):= x^2 3/2 * x + 2 into the first row and hitting the Enter key. Select the Slider tool from the Graphics View Toolbar and create two sliders a and b using the default settings of sliders. Hint: After tapping on the Graphics View, a window appears allowing you to specify the parameters of your slider. Tap Apply in order to close the window and create a slider. In the CAS View, create a linear function by entering g(x):= a * x + b into the next row and hitting the Enter key. In the Graphics View, use the Move tool in order to change the value of slider a to 0.5 and the value of slider b to 2. In the CAS View, enter h(x):= f(x) g(x) in order to determine the difference between those functions. Enter h(x), then select the tool Factor from the CAS View Toolbar in order to factorize the polynomial. Hint: You can now use these factors to determine the roots of h(x). GeoGebra Quickstart, Version

7 7 Enter Solve[h(x)] in order to confirm the roots. Hint: GeoGebra creates a list of points which can be displayed in the Graphics View by tapping on the Show / Hide Object icon below the corresponding row number of the CAS View. Enter Intersect[f(x), g(x)] in order to create the intersection 8 points of functions f(x) and g(x). Hint: You might want to display the intersection points in the Graphics View as well. Exploration: Try to find out what the intersection points of f(x) and g(x) have in common with the roots of the difference function h(x). 9 Change the parameters of the linear function to find out for which values of a and b there are two, one, or no intersection point(s). Hint: Use the Move tool in order to change the values of the sliders and create new functions to explore. Hints The CAS View allows you to work with fractions, equations and formulas (that may include variables that have not already been defined). Input and automatic completion = Enter y = 2 x + 1 in order to define an equation. := () [] Enter f(x):= 2x + 1 in order to assign the name f to the function. If you enter opening parentheses or brackets, GeoGebra will automatically insert the corresponding closing counterpart. While entering a command in the CAS View, GeoGebra tries to automatically complete your command in order to help you with the syntax. Hint: Select the command you want from the appearing list and hit Enter in order to accept the suggestion. The CAS Toolbar offers three different tools to evaluate your input with: 'Evaluate' calculates and simplifies the input in a symbolic way. 'Numeric' calculates the input numerically and yields the result in decimal notation. 'Keep Input' keeps and checks the input. This is very useful if you don t want your input to be simplified automatically, for example when introducing the manipulation of expressions. You can also manipulate only part of an expression by selecting it and then tapping on a tool like Factor. GeoGebra Quickstart, Version

8 Example 4: Scatter Plot and Best Fit Line Task: Create a Scatter Plot and conduct a Two Variable Regression Analysis for a given data set. Explore how outliers affect the best fit line. Preparations Open the GeoGebra Web or Tablet App and select the Spreadsheet Perspective from the Perspectives Start Screen. OR Tap on the Menu button on the top right corner of the GeoGebra window and select New from the File menu. Then select the Spreadsheet Perspective from the Perspectives Start Screen. Construction Steps In the Spreadsheet View, enter the following data values into the cells of column A: A1: 1 A2: 5 A3: 2 A4: 8 A5: -2 Hint: Always evaluate your input by tapping the Enter key. Enter the following numbers into the spreadsheet cells of column B: B1: -1 B2: 2 B3: 3 B4: 4 B5: 1 Create a Scatter Plot from this data: Highlight all cells of columns A and B that contain data. Then, select the tool Create List of Points from the Spreadsheet View Toolbar and tap Create in order to create points from your data set. Note: The values in column A determine the x-coordinates and the values in column B specify the y-coordinates of the plotted points. Hint: You might want to use tool Move Graphics View if not all five points are visible in the Graphics View. GeoGebra Quickstart, Version

9 4 5 Select the Best Fit Line tool from the Graphics View Toolbar. Create the line that best fits your data points by using a selection rectangle that contains all data points plotted. Hint: Create a selection rectangle by tapping in the upper left corner of the Graphics View and steadily sliding your finger to the lower right corner of the Graphics View. Make sure that all data points lie within the selection rectangle. Exploration: Using this construction you can easily demonstrate how outliers affect the best fit line of a data set. Select the Move tool and drag one of the points in order to create an outlier. Hint: You can also change the initial data directly in the Spreadsheet View. Hint You may change the style (e.g. color, thickness) of the line and points. Select the object you want to enhance and then tap the Style Bar Button in the upper right corner of the Graphics View in order to open the Style Bar. Example 5: Intersection of a Plane and a Line Task: Find out how you can intersect a plane and a line in the 3D Graphics View of GeoGebra. GeoGebra Quickstart, Version

10 Preparations Open the GeoGebra Web or Tablet App and select the 3D Graphics Perspective from the Perspectives Start Screen. OR Tap on the Menu button on the top right corner of the GeoGebra window and select New from the File menu. Then select the 3D Graphics Perspective from the Perspectives Start Screen. Construction Steps Hints Enter p: x + y = z into the Input Field in the Algebra View and tap the Enter key in order to define a plane p. Create two points A and B by entering A = (3, 4, 3) and B = (-4, -2, -1) in the Algebra View and tapping the Enter key after each input. Select the Line tool from the 3D Graphics Toolbar and tap on the points A and B respectively to create the line a through both points. Select the Intersect tool. Then, tap on the plane and the line in order to create the intersection point C. Exploration: Use the Move tool in order to change the position of the points A and B. What happens to the intersection point if the line is parallel to the plane, or if both points lie within the plane? Hint: By clicking on a point you may switch between moving the point parallel to the x-y-plane or parallel to the z-axis. You might want to use the tool views on your construction. Rotate 3D Graphics View to get different You might want to enhance the appearance of your construction by using the Style Bar. Select the object you want to enhance and then tap the Style Bar Button in the upper right corner of the Graphics View in order to open the Style Bar. You can also hide the x-y-plane or the coordinate axes using the Style Bar. Tap on the white background of the Graphics View to make sure that no object is selected before you open the Style Bar. Further Information You can find further information, materials, and help on our web pages at GeoGebra Quickstart, Version

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