Question

如图，正方形边长为一，求阴影部分面积

Answer 1

H=√{1²-（1/2）²}=√3/2

S1=1*1-π*1²*（30/360）*2-1*（√3/2）/2=1-π/6-√3/4=0.044

S2=1*1-π*1²/4-2S1=1-π/4-2*0.044=1-π/4-0.088=0.127

S/2+S2=π*1²/4-1*1/2=π/4-1/2

S/2=π/4-1/2-S2=π/4-1/2-0.127

S=π/2-1-0.254=0.316

Answer 2

如图，怎么求阴影面积，告诉了正方形边长。

Answer 3

几年级的？好难啊