UPDATED Mathematics for Elementary Educators III - D127 Images included

vertical line A line that runs up and down on the coordinate plane, parallel to the y- axis. It has no run, or change in x-value. complementary angles Two angles whose sum is equal to 90°. line A straight one-dimensional figure that extends infinitely in both directions. origin The point on a coordinate plane where the x-axis and y-axis intersect. Typically, the point represents 0 on both axes. tangent A straight line that touches a circle at only one point. circle The set of all points that are equidistant from a point. inscribed angles Shape formed when 2 lines or rays meet with a vertex that meets the circumference of a circle. line segment Shortest distance between two points; completely straight with two endpoints. diagonal A line segment with vertices as endpoints that is not an edge. rhombus Quadrilateral with four equal sides, equal opposite angles, and two sets of parallel opposite sides. isosceles trapezoid Quadrilateral with one pair of parallel opposite sides (the bases) and another pair of equal opposite sides. vertex A point where two line segments meet to form an angle. interior angle An angle inside a shape between two joined sides. Pythagorean theorem