切线长定理从圆外一点可以引圆的两条切线它们的切线长相等.这一点和圆心的连线平分这两条切线的夹角.即如图papb分别为⊙o的切线切点 Template




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tomski切线长定理从圆外一点可以引圆的两条切线它们的切线长相等.这一点和圆心的连线平分这两条切线的夹角.即如图papb分别为⊙o的切线切点 coloring