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How to find the area of the shadow part of the second shape on page 85 of the sixth grade in Hubei Province?
3. 14×3^2× 1/4+3. 14×4^2× 1/4-3×4 =3. 14×9× 1/4+3. 14× 16× 1/ 4- 12 =28.26× / kloc-0// 4+3. 14×4- 12 =7.065+ 12.56- 12 = 19.625 - 12 =7.625