Dilation, The size of a figure is changed (either expanding or shrinking it) without changing the figures shape., Rotational Symmetry, Exists in a shape when it looks the same after being rotated by a certain angle (less than 360 degrees) around a central point., Leg, The two sides of a right triangle that meet to form a right angle., Segment Bisector, Point, line, segment or ray that divides the measure of a segment into two equal/congruent parts., Coplanar, Two or more points, lines, segments or rays on the same plane., Translation, Moves every point of a figure the same distance and the same direction (a “slide” along the coordinate plane)., Line, A one-dimensional figure that is straight, has indefinite length in two directions, and no thickness., Congruent, Same size, same shape., Line Segment, A piece of a line contained by two points including the two points., Rotation, Turns a figure around a fixed point called the center of rotation (a “turn” on the coordinate plane)., Ray, All points on a line that are on one side of a fixed point including the fixed point., Point, A location in space (no width, depth, etc.)., Pythagorean Theorem, Formula used with right triangles to find the missing leg or hypotenuse., Perpendicular, Two intersecting lines or line segments within a plane that form a right angle., Adjacent, The side next to a given angle; beside or next to., Line Symmetry, Occurs when a figure can be divided into two identical halves by a line, and one half is a mirror image of the other., Parallel, Two lines on the same plane that will never intersect., Opposite, The side across from a given angle., Angle, Two rays that share a common endpoint., Plane, A flat two-dimensional surface that extends infinitely in all directions; it has no thickness and is defined by three non-collinear points., Reflection, Flips a figure over a line known as the line of reflection (a “flip” on the coordinate plane)., Collinear, Two or more points on the same line., Vertex, The common endpoint where two rays meet to form an angle., Hypotenuse, The side of a right triangle that is across from/opposite from the right angle; it is also the longest side of a right triangle., Midpoint, Point on a line segment that divides the segment into two equal/congruent parts., Angle Bisector, Ray dividing the measure of an angle into two equal/congruent angles., Acute, An angle between zero and ninety degrees., Rigid Motion, Transformations where the size and shape of a figure does not change (i.e. translations, rotations and reflections).

Unit 1 Test Prep

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