How do i tell whether the given side length is a right angle

The sum of the lengths of any two sides of a triangle is greater than the length of the third side. If you take the three sides of a triangle and add them in pairs, the sum is greater than (not equal to) the third side. If that is not true, then it is not possible to construct a triangle with the given side lengths.

Step-by-step explanation:

the angle on the end of the length should have a square.

Step-by-step explanation: In math and geometry, a square around an angle shows 90 degrees, which is another meaning of a right angle. If a triangle or square has a right angle of 90 degrees, it will show it by having the square in the vertice.

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times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3