Whiteboardmaths.com © 2004 All rights reserved 5 7 2 1

Area of a Triangle The area of a triangle = ½ the area of the surrounding rectangle/parallelogram base height Area of a triangle = ½ base x height

Area of a Triangle The area of a triangle = ½ the area of the surrounding rectangle/parallelogram base height rectangle area = 2 + 2 triangle area = ½ rectangle area Area of a triangle = ½ base x height

Find the area of the following triangles. 8 cm 10 cm 14 cm 12 cm 9 cm 16 cm Area = ½ b x h 3.2 m 4.5 m 7 mm 5 mm Area = ½ x 8 x 9 = 36 cm2 Area = ½ x 10 x 12 = 60 cm2 Area = ½ x 14 x 16 = 112 cm2 Area = ½ x 3.2 x 4.5 = 7.2 m2 Area = ½ x 7 x 5 = 17.5 mm2