adjacent angles - two angles that a common side, and a vertex, and do not overlap, angle - formed by two rays or line segments that have the same endpoints; several can be formed when two or more lines cross, complementary angles - two angles whose sum adds to 90°, congruent - have the same measure; identical in form, diameter of a circle - the distance across the circle through the center; twice the radius, hypotenuse - the side of a right triangle opposite the right angle, legs of a right triangle - the two sides of a triangle that form a 90-degree angle, line segment - a continuous series of points that go in two directions with two endpoints in one dimension, parallel lines - two lines on the same plane that never meet, pi - the ratio of the circumference to the diameter of a circle; approximately 3.14, plane - set of points composing a two-dimensional surface; has no boundaries, point - indicates place or position; it has no length, width or thickness, Pythagorean Theorem - for a right triangle, the square of the hypotenuse is equal to the sum of the squares of the legs, radius of a circle - the distance from the center to a point on the circle; half the diameter, right angle - an angle measuring 90º, right triangle - a three-sided polygon with a right angle, supplementary angles - two angles whose sum adds to 180°, volume - amount of space a three-dimensional figure takes up, measured in cubic units: length x height x width, alternate exterior angles - the congruent angles formed by a transversal that are outside of the parallel lines, alternate interior angles - the congruent angles formed by a transversal that are between the parallel lines, cone - a three-dimensional figure with one circular base and one vertex, corresponding angles - congruent angles formed by a transversal that have a similar position on each of the parallel lines, cylinder - a three-dimensional figure with parallel sides connecting circular opposite bases, dilation - a transformation that either enlarges or reduces a figure to make a similar image, image - the new figure formed by a transformation, polygon - a closed plane figure formed by three or more line segments that intersect only at their endpoints., preimage - the original figure in the transformation of a figure, proportional - having a constant ratio to another quantity, reflection - a transformation that flips the figure over the line of symmetry, rotation - a transformation in which every point of the preimage is turned by a given angle about a point, sphere - a solid figure shaped like a ball where every point on the surface is the same distance from the center, square root - a number which produces a specified quantity when multiplied by itself, transformation - a type of function that describes a change in the position, size, or shape of a figure, transformation sequence - the transformation process followed to change one figure into another, translation - a transformation in which the preimage is moved (slide) up, down, or sideways, transversal - a line that intersects two or more lines at different points,

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