Question

求这些图形的阴影部分面积

Answer 1

(1) (15+8)*4/2-4*4*3.14/2

=46-6.28=39.72

(2) 10*5-5*5*3.14/2+5*5*3.14/2-10*5/2

=50-25=25

(3) 8*8*3.14/4-4*4*3.14/2

=(16-8)*3.14=8*3.14=25.12

(4) 6*6-6*6*3.14/4+6*6*3.14/4

=36