Question

Find the area of the region shaded in green. Use 3.14 to approximate pi.

Answer 1

254 cm² (to 3 s.f.)

Explanation:

Area of shaded region

= area of large circle -area of smaller circle

`\boxed{area \: of \: circle = \pi {r}^(2) }`

Radius of large circle= 15cm

Radius of smaller circle= 12cm

Area of shaded region

= π(15²) -π(12²)

= 225π -144π

= 81π

= 81(3.14)

= 254.34

= 254 cm² (3 s.f.)