Hard
Using Heron's formula, find the area of a triangle with sides 5 cm, 6 cm, and 7 cm.
Explanation
Explanation
Semi-perimeter s = (5+6+7)/2 = 9.0. By Heron's formula, Area = √[s(s-a)(s-b)(s-c)] = √[9.0 × 4.0 × 3.0 × 2.0] = √216.00 ≈ 14.70 cm².
PRO TIP
Re-check your working by substituting the answer back into the original question.