Question 520113: Triangle ABC has sides of length 15cm, 13cm and 7cm. Is triangle ABC a right angled triangle?
Answer by mamiya(56)   (Show Source):
You can put this solution on YOUR website! Triangle ABC has sides of length 15cm, 13cm and 7cm. Is triangle ABC a right angled triangle?
ABC is a right angled triangle, if the square of one of his hypotenuse( which is the longest side of a right angled triangle) is the sum of the square of the others sides.
with this data, the longest is 15.
we know, 15^2=225 and 13^2+7^2=218
225 is different from 218, means 15^2 is different from (13^2+7^2)
so the triangle ABC is not a right angled triangle.
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