Question

lila made a triangular flag to cheer on her favorite sports team. the perimeter of the flag is 20 inches. approximately how many square inches of fabric were used to make the triangular flag? 15 square inches 76 square inches 186 square inches 215 square inches herons formula: area = $sqrt{s(s - a)(s - b)(s - c)}$

Explanation:

Step1: Find third side length

Perimeter = 20, two sides = 8,8. Third side = 20 - 8 - 8 = 4.

Step2: Calculate semi-perimeter

s = 20 / 2 = 10.

Step3: Apply Heron's formula

Area = √[10(10-8)(10-8)(10-4)] = √(10×2×2×6) = √240 ≈ 15.

Answer:

A. 15 square inches