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      Question

      What is the area of a triangle whose sides are 13 cm, 14

      cm and 15 cm?
      A 78 sq cm Correct Answer Incorrect Answer
      B 84 sq cm Correct Answer Incorrect Answer
      C 90 sq cm Correct Answer Incorrect Answer
      D 96 sq cm Correct Answer Incorrect Answer

      Solution

      ATQ, Using Heron's formula: s = (13 + 14 + 15)/2 = 42/2 = 21 Area = √[s(s-a)(s-b)(s-c)] = √[21 x 8 x 7 x 6] = √[7056] = 84 sq cm

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