Rectangle l - length w - width
Square s – side length s s s
Circle r d r – radius d – diameter C - circumference
Parallelogram b - base h - height
Triangle b - baseh - height b h b h
Equilateral Triangle s – side length s s s
Rhombus d2d2 Facts: All 4 sides are congruent The diagonals bisect each other The diagonals are perpendicular to each other d1d1
Kite d2d2 Facts: The longer diagonal bisects the smaller diagonal The diagonals are perpendicular to each other d1d1
Trapezoid b 1, b 2 - bases b2b2 b1b1 h
Regular Polygon s – side length a - apothem Example: Regular Hexagon s s s s s s a P – Perimeter