Q5 of 69 Page 250

Using Heron’s formula find the area of Δ ABC in which BC = 13 cm, AC = 14 cm and AB = 15cm.

It is given in the question that,

Sides or triangle ABC are:


BC = 13 cm


AC = 14 cm


AB = 15 cm


We know that,


Perimeter of triangle = Sum of all sides


= AB + BC + AC


= 15 + 13 + 14


= 42 cm


∴ s =


=


= 21 cm


Hence,


Area of =


=


=


= 84 cm2


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