Question

A rocket drawing has the measures as given in the figure. Find its area

Answer 1

Area = Area of a rectangle + Area of a triangle + Area of a trapezium

For rectangle length l = 120 – 20 – 20 cm = 80 cm

Breadth b = 30 cm

For the triangle base = 30 cm

Height = 20 cm

For the trapezium height h = 20 cm

Parallel sided a = 50 cm

b = 30 cm

∴ Area of the figure = `("l" xx "b") + (1/2 xx "base" xx "height") + 1/2 xx "h" xx ("a" + "b")  "sq.units"`

= `(80 xx 30) + (1/2 xx 30 xx 20) + 1/2 xx 20 xx (50 + 30)  "cm"^2`

= 2400 + 300 + 800 cm²

= 3500 cm²

Area of the figure = 3500 cm²