等边三角形三边相等三内角相等。直角三角形有一个角等于90度。

An equilateral triangle has all sides equal and all angles equal. A right triangle has one Angle equal to 90 degrees.

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例如，直角三角形斜边的平方，等于其它两边的平方和。

For example the square on hypotenuse of a right Angle triangle is equal to the sum of the squares of the other two sides.

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于是，斜边为10的直角三角形斜边上的高必须小于等于5，也就是说，面试官所说的直角三角形根本不存在。

Therefore, a right triangle with a hypotenuse of 10 can have an altitude on its hypotenuse of at most 5.

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