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。
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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