In a right triangle ABC, the right angle is at B. What is the length of the missing side in the figure?

5 cm

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7 cm

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12cm

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25 cm

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Solution

The correct option is A
5 cm

Using Pythagoras theorem in triangle ABC:

${Hypotenuse}^{2} =$ Sum of squares of other two sides

That is,

$c^{2} = a^{2} + b^{2}$

Here, $a = 4 c m$ and $b = 3 c m,$

So, the missing side, $c = \sqrt{3^{2} + 4^{2}} = 5 c m$

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