Q. 143.9( 12 Votes )

A triangle and a

Answer :

Let a, b and c are the sides of triangle and s is


the semi-perimeter, then its area is given by:


A = where [Heron’s Formula]


= = 21


A=


A = = cm2


Therefore area of ∆ =


84 × 2 = 14× Altitude


Altitude = 12 cm


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