Consider a right-angled triangle with length of sides a, b and c. If a = 3 cm, b = 4 cm, then find the value of hypotenuse c?

10 cm

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5 cm

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25 cm

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20 cm

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Solution

The correct option is B 5 cm
If a and b are sides of length 3 cm and 4 cm then the value of hypotenuse, c can be found out by
$c^{2} = a^{2} + b^{2}$
$c^{2} = 3^{2} + 4^{2}$
$c^{2} = 25$
$c = \sqrt{25}$
$c = 5 c m$

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