The semi-perimeter, s, of a triangle having sides $12, 9 and 15$ is ___.

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Solution

$Semi perimeter, s = \frac{a + b + c}{2}$ ,
where a, b and c are the sides of the triangle.
$s = \frac{12 + 9 + 15}{2}$
$= \frac{36}{2} = 18$

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