Geometric shapes and angle types explained with diagrams and formulas.

A comprehensive educational diagram illustrating various geometric concepts including types of angles (zero, acute, right, obtuse, straight, reflex, full), parts of a circle (radius, diameter, chord, arc, tangent, sector, quadrant), and definitions of intersecting, perpendicular, and parallel lines, along with formulas for perimeter and area of common shapes like rectangle, square, triangle, trapezoid, and circle.