Question

A circle with the radius of 9cm sits inside a circle with radius of 11cm. what is the area of the shaded region? Round your final answer to the nearest hundredth.

Answer 1

Answer:

125.714. estimated value=100

Step-by-step explanation:

area of the shaded region=π{11^2-9^2}=22/7*{121-81}=22/7*{40}=22*5.714=125.714

estimation to the nearest hundredth value=100

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Answer 2

Answer:

125.6 sq.cm

Step-by-step explanation:

Area of circle with radius 11 cm :

$\pi *11^{2}$ = $3.14 * 11 * 11$ = 379.94 sq.cm

Area of circle with radius 9 cm :

$\pi * 9^{2} = 3.14 * 9 * 9$ = 254.34 sq.cm

Difference = 125.6 sq.cm