Area P6 2009 SA2 P2 MGS Q5

5. The diagram below, not drawn to scale, shows a shaded triangle drawn within a rectangle. The ratio of the length AB to the length of the rectangle is 1 : 3. Calculate the area of the shaded triangle.

36 ÷ 3 = 12

1/2 x 12 x 28 = 168 cm²