等边三角形、正方形、半圆形的对称轴的条数分别为x，y，z，则x2+y2=请选择ABC2p1A.K5G8K1H8t3j(c7L6b*M;m.y-o5z0y1F7\6w+K*I
A．53j(c7L6b*M;m.y-o5z0y1F7\6w+K*I
B．103j(c7L6b*M;m.y-o5z0y1F7\6w+K*I
C．253j(c7L6b*M;m.y-o5z0y1F7\6w+K*I