Question

Find the area of the triangle ∆ABC in which a = 1, b = 2 and ∠c = 60°.

Answer 1

Given,

a=1, b=2 and ∠C=60°

By Cosine law,

2 = 1 + 4 - c²

c² = 5 - 2

c² = 3

c = √3

By Heron’s Law,

Area of Triangle,