Question

A graphic artist is designing a company logo with

two concentric circles (two circles that share the
same center but have different radii). The artist
needs to know the area of the shaded band
between the two concentric circles. Explain to the
artist how he would go about finding the area of
the shaded region.

Answer 1

Explanation:

Radius of outer circle = R = 9 cm

Radius of inner circle = r = 5 cm

Area of the shaded region = area of the outer circle - area of the inner circle.

= πR² - πr²

= π(R² - r²) = 3.14*(9² - 5²)

= 3.14 * (81- 25) = 3.14 * 56

= 175.84 cm²