prove that the triangle with sides 9 cm , 12 cm and 15 cm is right angled angled triangle?
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A right triangle defines as two of the lower sides squared being equal to the longest side squared. This might come as little complex but to provide an example...
3,4,5 triangle.
3² = 92
4² = 16
5² = 25
(Remember, the lowest sides "3 and 4" squared are being added and it equals the longest side squared or 5 squared.)
Therefore 3,4,5 triangles exist.
.It's similar to this situation because...
9² = 8112² = 144
15² = 225
81 +144 = 225
Therefore, yes it is a right angle triangle
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