Friday, 24 May 2019 Formulae for Finding the Area of the Rectangle, Triangle, Parallelogram and Trapezium

The Rectangle 3 4 Height Base Area = Base x Height A = BH Area = 4 x 3 Area = 12 square units Area = 12 units2 3 4 Height Base Area = Base x Height A = BH

From Rectangles to Triangles Height Base Base Notice that a rectangle contains 2 triangles Area = Base x Height ÷ 2 A = BH ÷ 2 (or) ½ BH

Triangle Base Base Height Area = Base X Height ÷ 2 A = BH/2 (OR) ½BH A = 8 X 12 ÷ 2 A = 48 cm2 Height is12cm Base is 8 cm

Parallelogram Height Base Area = Base x Height A = BH

Height Base

Trapezium b a c Area = a x (b + c) ÷ 2