Question

Find the area of a triangle whose sides are 13 cm, 14 cm, and 15 cm.

Solution

1. The semi-perimeter is s = (13 + 14 + 15) / 2 = 21 cm.
2. Area = √(s(s - a)(s - b)(s - c)) = √(21 x 8 x 7 x 6).
3. 21 x 8 x 7 x 6 = 7,056, and √7,056 = 84.
4. The area is 84 cm^2.