A right triangle has legs $9$ m and $12$ m. The hypotenuse is

A right triangle has legs $9$ m and $12$ m. The hypotenuse is
  1. $15$ m
  2. $21$ m
  3. $11$ m
  4. $18$ m

Solution

Hypotenuse $= \sqrt{9^{2} + 12^{2}} = \sqrt{81 + 144} = \sqrt{225} = 15$ m.

Asked in: IMO

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