a triangle with an angle that measures exactly 90° scalene triangle a triangle with no equal sides sector a slice of a circle formed by two radii and an arc similar polygons two or more polygons with equal corresponding angles and corresponding sides in proportion slope the steepness of a line, as determined by , or y x 2 2 y x 1 1 , on a coordinate plane where ( x 1 , y 1 ) and ( x 2 , y 2 ) are two points on that line solid a three-dimensional figure square a parallelogram with four equal sides and four right angles supplementary angles two angles whose sum is 180° vertical change horizontal change – G E O M E T R Y R E V I E W – 9 7
surface area the sum of the areas of the faces of a solid tangent a line that touches a curve (such as a circle) at a single point without cutting across the curve. A tangent line that touches a circle at point P is perpendicu- lar to the circle’s radius drawn to point P transversal a line that intersects two or more lines vertex a point at which two lines, rays, or line segments connect vertical angles two opposite congruent angles formed by intersecting lines
