Sir Mike Ambrose is the author of the question.
Calculating the circle's radius, r.
21r + 15r + 12√(2)r = 21*12√(2)sin45
(36+12√(2))r = 252
r = 252/(36+12√(2)) cm
r = 3(3-√(2)) cm
It implies;
The exact area of the Circle in terms of π square cm is;
π(9-3√(2))²
= 9π(11-6√(2)) cm²
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