Question

The sides of a triangle are 7 cm, 9 cm and 14 cm. Its area is

(a) $12\sqrt{5}c{m}^2$

(b) $12\sqrt{3}c{m}^2$

(c) $24\sqrt{5}c{m}^2$

(d) $63c{m}^2$

Answer 1

The area of a triangle having sides a, b, c and s as semi-perimeter is given by,

, where

Therefore the area of a triangle having sides 7 cm, 9 cm and 14 cm is given by

a = 7 cm ; b = 9 cm ; c = 14 cm

Therefore the answer is (a).