看图填空。3R5{)x2G2z*]'W0^4Y4R
3R5{)x2G2z*]'W0^4Y4R
(1)图Ⅱ是将图I中半圆BmO以(V,t4_1c.e6^点为中心顺时针旋转0N)g4u7\/V+I.H:c.q-f/S8z4m7W2j得到的。3R5{)x2G2z*]'W0^4Y4R
(2)若AO=5cm,那么图I中阴影部分的面积是2A(|;U,p+o.x1J)i5t3T*V(F)}cm2,阴影部分的周长是0F8r+j4a.s4R9]cm。3R5{)x2G2z*]'W0^4Y4R