Triangle A = ½ ×base× height h h b b Square or rectangle A = length× width l l w w Trapezoid b A = ½ (sum of bases) ×height h b Parallelogram A= base × height h b Circle A = π × r 2 rrrrrr
Triangle h h b b A = ½ ×base× height Square or rectangle l l w w A = length× width Trapezoid b h b A = ½ (sum of bases) ×height Parallelogram h b A= base × height Circle rrrrrr A = π × r 2