The semi-perimeter of a triangle is

MATHEMATICS · Single correct · CBSE · Mathematics · Heron's Formula · Heron's Formula

Problem

12\,\text{cm}

. Two of its sides measure

7\,\text{cm}

and

8\,\text{cm}

, and its area is

30\,\text{cm}^2

. The third side is (a)

9\,\text{cm}

(b)

7.5\,\text{cm}

(c)

8.25\,\text{cm}

(d)

9.5\,\text{cm}