Find the area of a triangle whose length of each side is 13 inches, 15 inches and 14 inches.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 84 square inches.
Semi-perimeter (s) = (13 + 15 + 14)/2 = 42/2 = 21
Area of a triangle = √[s(s - a)(s - b)(s - c)]
= √[21(21 - 13)(21 - 15)(21 - 14)]
= √(21 × 8 × 6 × 7)
= √7056
= 84 square inches