A triangle has sides 8 cm and 10 cm, and the angle between…

A triangle has sides 8 cm and 10 cm, and the angle between them is 120°. What is its area?

Show answer & explanation

Correct answer: B

Explanation

The correct answer is option 2 i.e. 20 $\sqrt{3}$ cm².

Area = $1\over2$ × a × b × sinθ

⇒ $1\over2$ × 8 × 10 × sin120°

⇒ 40 × $√3\over2$ = 20√3 cm²

SSC CGL 2025 PYQ — Question 64