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The area of the shadow part of mathematics in the sixth grade of primary school
Connect CD and DF, and divide the shaded part into three parts:

1, triangular ACF with an area of (12-10) ×10 ÷ 2 =10cm2.

2. A triangular AFD with an area of10×10×1/2 = 50 cm2.

3. Arch area: 3. 14× 12? × 1/4- 12× 12× 1/2 = 4 1.04 cm2。

Merge:10+50+41.04 =101.04cm2.

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