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Question

The sides of certain triangles are given below. Determine which of them are right triangles.
(i) a = 7 cm, b = 24 cm and c = 25 cm
(ii) a = 9 cm, b = 16 cm and c = 18 cm

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Solution

(i) We know that in a right-angled triangle, the square of the largest side is equal to the sum of the squares of the smaller sides. Here, the larger side is c, which is 25 cm.c2=625We have:a2+b2=72+242=49+576=625=c2Thus, the given triangle is a right triangle.

(ii) We know that in a right-angled triangle, the square of the largest side is equal to the sum of the squares of the smaller sides. Here, the larger side is c, which is 18 cm.c2=324We have: a2+b2=92+162=81+256=337c2Thus, the given triangle is not a right triangle.

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