This document provides definitions and key information about basic geometric shapes including lines, angles, triangles, quadrilaterals, circles, and other polygons. It defines lines, rays, segments, parallel and intersecting lines. It also defines different types of angles such as acute, obtuse, right, complementary and supplementary angles. Triangle definitions include right, obtuse, acute, scalene, isosceles, equilateral and formulas for interior angles and perimeter. Quadrilaterals defined include trapezoid, parallelogram, rectangle, rhombus, square with formulas for area and perimeter. Circles are defined by chord, diameter, radius, sector, circumference and area. Other polygons like hexagons and octagons