acute angle acute triangle Cartesian coordinate system concave polygon congruent figures
convex polygon coordinate grid coordinates dilatation equilateral triangle
horizontal axis intersecting lines isosceles triangle obtuse angle obtuse triangle
ordered pair (x,y) origin parallel lines perpendicular lines quadrant
quadrilateral reflection reflex angle regular polygon right angle
right prism right triangle rotation scalene triangle similar figures
tessellations tiling the plane transformation translation vertical axis
x-axis x-coordinate y-axis y-coordinate
An angle measuring less than 90 o. A triangle with three acute angles (angles whose measure is between 0 o and 90 o ). A plane that contains an x-axis (horizontal) and a y- axis (vertical) which are used to describe the location of a point. A polygon that has at least one angle greater than 180 o
Figures that have the same size and shape, but not necessarily the same orientation. A polygon that has all angles less than 180 o A two-dimensional plane that contains an x-axis (horizontal) and a y-axis (vertical), which are used to describe the location of a point. Also called Cartesian coordinate grid or Cartesian plane. The numbers in an ordered pair that locate a point on a grid. Example: The coordinates (3, 5) describe a location found by moving 3 units to the right and 5 units up from the origin (0, 0).
A transformation that enlarges or reduces a shape by a scale factor to form a similar shape. A triangle with three equal sides. The horizontal number line on a coordinate grid. Also referred to as the x-axis. Lines that meet or cross each other and that have exactly one point in common, the point of intersection.
A triangle that has two sides of equal length. An angle measuring greater than 90 o and less than 180 o. A triangle with one angle greater than 90 o. Two numbers, in order, that are used to describe the location of a point on a plane, relative to a point of origin (0, 0); Example: (2,6)
The origin on a Cartesian coordinate plane is (0,0). Lines on the same flat surface that do not intersect Two lines in the same plane that intersect at a 90 o angle. One quarter of the Cartesian plane, bounded by the coordinate axes.
A four-side polygon. Example: A square, a rectangle, a parallelogram, a rhombus, and a trapezoid. A transformation that is illustrated by a figure and its image in a mirror line. An angle measuring between 180 o and 360 o. A polygon that has all sides equal and all angles equal.
A 90 o angle A prism whose rectangular faces are perpendicular to its congruent bases. A triangle that has one right angle (an angle that measures 90 o ). A transformation that turns a shape about a fixed point to form a congruent shape. Also called a turn.
A triangle with three sides of different lengths. Figures with the same shape, but not necessarily the same size. If one shape is similar to another shape, there exists a dilatation that will transform the first shape into the second shape. A tiling pattern in which shapes are fitted together with no gaps or overlaps. A regular tessellation uses congruent shapes. The process of using repeated shapes, which may or may not be congruent, to cover a region completely
A change in a figure that results in different position, orientation, or size. The transformations include translations, reflections, rotations, and dilatations. A transformation that moves a point or a figure in a straight line to another position on the same flat surface to form a congruent shape. The vertical line on a coordinate grid. Also referred to as the y-axis. The horizontal number line on a coordinate grid.
The first number in an ordered pair that describes the location of a point on the horizontal axis. The vertical number line on a coordinate grid. The second number in an ordered pair that describes the location of a point on the vertical axis.