1.
S阴影=S¼圆-S三角形
=π*6²/4-6²/2
=28.26-18
=10.26
2.
S阴影=S梯形-S¼圆
=(3+7)*3/2-π*3²/4
=15-7.065
=7.935
3.
S阴影=S半圆
=π*10²/2
=314/2
=157
1.
S阴影=S¼圆-S三角形
=π*6²/4-6²/2
=28.26-18
=10.26
2.
S阴影=S梯形-S¼圆
=(3+7)*3/2-π*3²/4
=15-7.065
=7.935
3.
S阴影=S半圆
=π*10²/2
=314/2
=157