Answer:
Explanation:
Given the following :
From the diagram:
Base of triangle = 20cm - ( 4 + 3)cm
Base of triangle = 20 - 7 = 13cm
Height = 9cm
Area of triangle = (0.5) × base × height
Area of triangle = 0.5 × 13 × 9 = 58.5cm^2
Area of rectangle = Length × width
Area of rectangle = 20 × 9 = 180
Shaded area = area of rectangle - area of triangle
Shaded area = 180cm^2 - 58.5cm^2
Shaded area = 121.5cm^2