The semi-perimeter of a triangle is

MATHEMATICS · Subjective · CBSE · Mathematics · Heron's Formula · Heron's Formula

Problem

11\text{ cm}

. Two of its sides measure

8\text{ cm}

and

7\text{ cm}

. If the area of the triangle is

30\text{ cm}^2

, calculate the length of the third side correct to one decimal place.