Question

Given the two concentric circles with center H below, find the area of the shaded region. Round your answer to the nearest tenth if necessary.

Answer 1

Answer:

A ≈ 194.8 units²

Step-by-step explanation:

the shaded area (A) is calculated as

A = area of outer circle - area of inner circle

   = πr₁² - πr₂² (r₁ is outer radius and r₂ the inner radius )

  = π × 13.5² - π × 4.5²

 = π(13.5² - 4.5²)

 = π(182.25 - 20.25)

 = π × 62

 ≈ 194.8 units² ( to the nearest tenth )