Question

The area of shaded region.

Answer 1

160π cm^2

Explanation:

Looks like the radius of the shaded area is (10 cm + 3 cm), or 13 cm, and that the radius of the white region is 3 m.

Thus, the area of the shaded region is:

π(169 - 9) cm^2, or 160π cm^2.

Answer 2

160π cm²

Explanation:

The area of the shaded region is

area of outer circle - area of inner circle

A = πr₁² - πr₂²

r₁ is the radius of the outer circle = 10 + 3 = 13 cm

r₂ is the radius of the inner circle = 3 cm

A = π × 13² - π × 3²

= π(169 - 9) = 160π cm² ≈ 502.65 cm² ( to 2 dec. places )