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Answer

The shaded area DBE = 3 * ( 12 * 12 – 3.14 * 12²/4)

= 3 * (144 – 113.04)

= 92.88 cm²

Shaded area C = 2 * ( 3.14 * 12²/4 – 1/2 * 12 * 12)

= 2 * ( 113.04 – 72)

=82.08 cm²

Total shaded area = 92.88 + 82.08 = 174.96 cm²

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