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Question

The sides of a triangle measure 13 cm, 14 cm and 15 cm. Its area is

(a) 84 cm2
(b) 91 cm2
(c) 168 cm2
(d) 182 cm2

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Solution

(a) 84 cm2

Let a = 13 cm, b = 14 cm and c = 15 cm
Then, s = a+b+c2 = 13+14+152 cm = 21 cm
∴ Area of the triangle = ss-as-bs-c sq. units
= 2121-1321-1421-15 cm2
= 21×8×7×6 cm2
= 3×7×2×2×2×7×2×3 cm2
= (2 × 2 × 3 × 7) cm2
= 84 cm2

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