Answer :

Let the third side of the triangle is

Since the perimeter of a triangle is given by:

dm

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]

= = 120

A =

A = = dm^{2}

Area of triangle =

1680 =

Altitude = 67.2 dm

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