证明 题目是英文的……For each of the following statements,prove that they are always true or construct an example to show that the statement could be false.(a) An internal bisector of an angle of a triangle hits the opposite side at its mid

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证明 题目是英文的……For each of the following statements,prove that they are always true or construct an example to show that the statement could be false.(a) An internal bisector of an angle of a triangle hits the opposite side at its mid
证明 题目是英文的……
For each of the following statements,prove that they are always true or construct an example
to show that the statement could be false.
(a) An internal bisector of an angle of a triangle hits the opposite side at its midpoint.
(b) A perpendicular bisector of a side of a triangle hits the opposite vertex.
(c) An altitude of a triangle is either an internal bisector of an angle or a perpendicular bisector of a side.
中文回答就行了……实在对题很看不明白
顺便求，

证明 题目是英文的……For each of the following statements,prove that they are always true or construct an example to show that the statement could be false.(a) An internal bisector of an angle of a triangle hits the opposite side at its mid
(a)题意为"三角形一个角的内分角线和对边的中点相交".错.因为等边三角形的内分角线才能平分对边,等腰三角形的两腰夹角也行.
(b)题意为"三角形一边的中垂线和对顶相交".错...一样
(c)题意为"三角形的高线是一个角的角平分线或者一边的中垂线".错..三角形的高线是一条通过顶点并且和对边或者对边的延长线垂直的直线.

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