Find the semi-perimeter of a triangle whose sides are 12 cm, 10 cm, and 14 cm.

Given: The sides of the triangle are 12 cm, 10 cm, and 14 cm.

Semi-perimeter  $\left(s\right) = \frac{a+b+c}{2}$

$\Rightarrow s = \frac{12+10+14}{2}$

$\Rightarrow s = 18$ cm

Hence, the semi-perimeter of the triangle is 18 cm.