# Topic Area: Circles. Definitions. Formulas Distance Formula: D = ( x x ) + ( y ) Equation of a Circle: Activity 8 Algebra II with the Casio fx-9750gii

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1 Where Did That Come From? Teacher Notes Topic Area: Circles NCTM Standards: Use symbolic algebra to represent and explain mathematical relationships. Use geometric models to gain insights into, and answer questions in other areas of mathematics. Recognize and apply mathematics in contexts outside of mathematics. Objective The student will be able to write the equation of a circle given the center and radius, find the intersection of two circles using a graphing calculator, and apply finding the equation and intersections of circles to problem solving. Getting Started Discuss with students how sound and motion waves travel. Give examples such as dropping a stone in a pond and discuss how this is related to earthquakes. Discuss with them how triangulation is used to locate a particular site. Have the students create a list of places where this would be useful. Prior to using this activity: Students should have an understanding of how to write an equation for a circle. Students should have an understanding of how to find the intersection of two functions. Ways students can provide evidence of learning: The student will be able to graph and locate the intersections of two or more circles. The student will be able to discuss the difference between using circles and linear functions when using triangulation. Common calculator or content errors students might make: Students may use the diameter instead of the radius in the equation of the circle. Students may make sign errors on the center of a circle when writing the equation. Definitions Radius Epicenter Formulas Distance Formula: D = ( x x ) + ( y ) Equation of a Circle: 1 y 1 ( x h) + (y k) = r

2 Where Did That Come From? How To The following will demonstrate how to graph a circle using the Conics Function, save it as the background for another graph, and use the Trace function to find the intersection for the two graphs using the Casio fx-9750gii. Circle 1: Center (, 1) Radius = 3 Circle : Center (-1, -4) Radius = 5 Draw the two circles and find the points of intersection. To enter values for a circle into the Conics Function: 1. Highlight the CONICS icon in the Main Menu and press l. Use N to scroll to the formula for a circle given the center and radius, press l.. Enter the values of H, K, and R for Circle 1, pressing l after each entry. The screen should look like the one to the right. Press u(draw) to view the graph. Note: The graph may appear elliptical due to the viewing window values. 3. To change the view screen so that the circle appears round, press e(v-window) and enter the following values: Xmin = -18.3; Xmax = 18.3 Ymin = -9.3; Ymax = 9.3 Press du(draw). The screen should look like the one to the right. To save a graph as a background for another graph: 1. Press iq(pict), then q(sto)1l. The graph can now be recalled to appear as the background of another graph.

3 . Press d; follow the steps above to enter the information for Circle. 3. To recall the background, press iq(pic), Then w(rcl) 1l. The screen at the right shows Circle with Circle 1 as a background. To trace a graph using the Trace function: 1. Press q(trace) and use \$ to move the cursor along the graph. Note: For tracing circles, the cursor will only move to the right.

4 Where Did That Come From? Activity When an earthquake occurs, it causes waves of energy in the form of movement. These waves are picked up by devices known as seismographs. In areas where earthquakes happen frequently, scientists set up a seismic network comprised of different stations that record these waves. In order to determine the origin, or epicenter of an earthquake, a system called triangulation is used. This method uses the intersection of three or more graphs is used to locate the position of the epicenter on a map. In this activity, you are going to calculate the distance from the epicenter of an earthquake to three different stations to determine the location of the epicenter. The grid at the right shows the location of the stations; each tick mark equals 10 km. Questions Station 1 1. What are the coordinates for each of the stations Station in the grid to the right? Station 1: Station : Station 3 Station 3:. Station 1 registers an earthquake and determines that its center is 60 km from the station. Write an equation to show the possible locations of this earthquake? 3. At the same time, Station registers the earthquake and determines that its epicenter is halfway between Station 1 and Station. How far is the epicenter from Station? Write an equation for possible locations for the earthquake from Station. 4. Graph the equations for questions and 3. What are the intersections between Station 1 and Station?

5 5. Station 3 also registers the earthquake. The seismologist determines that from the time it started until it reached the station was 5 sec. If it is known that the waves travel at 3 km/sec in this area, how far was the epicenter from Station 3? 6. Write an equation representing the distance of the earthquake from Station Graph the equation in question 6 along with the other two equations. What are the intersections between Station 1 and Station 3? 8. Determine the possible location for the epicenter of the earthquake. (Hint: Draw lines through the intersections from questions 4 and 7.) Extensions 1. Station 4 is located at (-80, -70) and registers an earthquake with an epicenter estimated to be 40 miles away. Station 1 registers the same earthquake with an epicenter that is 68 miles away after 5 min. What is the speed of the waves from the earthquake?. A new station is being established whose x-coordinate is halfway between Station 1 and Station 3 and whose y-coordinate is 50 miles north of Station 1. What will be the coordinates for the new station?

6 3. The epicenter of a minor earthquake is located at (-40, 35). If the range for registering earthquakes for each station is 80 miles, which stations will be able to register this earthquake? Justify your answer.

7 Solutions 1. Station 1: (0, 40) Station : ( 50, 10) Station 3: (60, 40). Center is (0, 40) Radius is 60 (x 0) + (y 40) = D= ( 50 0) + (10 40) 76km 76 = 38 km (x + 50) + (y 10) = (15.6, 6.) and ( 36.0, 45.3) km 6. (x 60) + (y + 40) = ( 9.7, 1.4) and (74.1, 33.7) 8. ( 13.1,.5) Extension Solutions 1. (68 40) mi. / 5 min. = 5.6 mi./min.. (40, 90) 3. Stations 1, 4, and 5. Answers will vary.

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