8.若底面为正三角形的几何体的三视图如图所示,则几何体的侧面积为( )
A. | $12\sqrt{3}$ | B. | $36\sqrt{3}$ | C. | $27\sqrt{3}$ | D. | 72 |
2.在极坐标系中,设曲线C1:ρ=2sinθ与C2:ρ=2cosθ的交点分别为A,B,则线段AB的垂直平分线的极坐标方程为( )
0 252734 252742 252748 252752 252758 252760 252764 252770 252772 252778 252784 252788 252790 252794 252800 252802 252808 252812 252814 252818 252820 252824 252826 252828 252829 252830 252832 252833 252834 252836 252838 252842 252844 252848 252850 252854 252860 252862 252868 252872 252874 252878 252884 252890 252892 252898 252902 252904 252910 252914 252920 252928 266669
A. | ρ=$\frac{1}{sinθ+cosθ}$ | B. | ρ=$\frac{1}{sinθ-cosθ}$ | C. | θ=$\frac{π}{4}$(ρ∈R) | D. | θ=$\frac{3π}{4}$(ρ∈R) |