This document defines and describes basic geometry terms related to lines, angles, triangles, quadrilaterals, and circles. It defines points, line segments, rays, intersecting lines, perpendicular lines, parallel lines, acute angles, obtuse angles, right angles, complementary angles, supplementary angles, triangles classified by angle size and side length, properties of quadrilaterals including rectangles, rhombi, trapezoids, and how to calculate areas and perimeters of basic shapes.