For example the square on hypotenuse of a right Angle triangle is equal to the sum of the squares of the other two sides.
例如，直角三角形斜边的平方，等于其它两边的平方和。
It is common sense that the sum of the Angle of triangle is 180 degree and the sum of any two sides of a triangle is greater than the third side.
三角形三个角之和是180度，三角形任意两边之和大于第三边，这些都是常识。
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