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Question

Which of the following can form the three sides of a right-angled triangle?


A

13cm, 17cm, 21cm

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B
7cm, 9cm, 11cm
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C
3cm, 4cm, 5cm
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D

12cm, 7cm, 16cm

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Solution

The correct option is C 3cm, 4cm, 5cm

3, 4, 5 form a Pythagorean triplet i.e. the sum of the squares of 3 and 4 equals the square of 5. Apart from this combination, none can form a right-angled triangle as they do not make up a Pythagorean triplet.


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