To find x,
We use Pythagorus Theorem, as it is a right triangle.
So,
(perpendicular)2 + (base)2 = (hypotenuse)2
(3)2 + (4)2 = (x)2
9 + 16 = (x)2
25 = (x)2
√25 = (x)
∴ x = 5 cm or hypotenuse = 5 cm
you’re welcome, LOL 
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