A triangular traffic sign has sides measuring 13 m, 14 m…

A triangular traffic sign has sides measuring 13 m, 14 m, and 15 m. If the cost to paint the sign is ₹5 per square meter, what will be the total expense to paint the entire sign?

Show answer & explanation

Correct answer: A

Explanation

The correct answer is option 1 i.e. ₹420.

Sides = 13, 14, 15

Semi-perimeter(s) = $13 + 14 + 15\over2$ = 21

Area = $\sqrt{[21(21−13)(21−14)(21−15)]}$

⇒ $\sqrt{21 × 8 × 7 × 6}$ = 84 m²

Cost = 84 × 5 = ₹420

SSC CGL 2025 PYQ — Question 63