Question

Find the area of the shaded regions. Give your answer as a COMPLETELY simplified EXACT VALUE OF π (no approximations).

Pls give answer with explanation making the answer clear.
A picture of your work on a piece of paper would be much appreciated thx.

Answer 1

Answer:

18π

Step-by-step explanation:

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Answer 2

Angle B /360 * πr²

80/360 * 3.14* 81

55.95