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+1 vote
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in Mathematics by (3.5k points)

Find the area of a triangle two sides of which are 18 cm and 10 cm and the perimeter is 42 cm.

1 Answer

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Best answer

Let the third side of the triangle be x.

Perimeter of the given triangle = 42 cm

18 cm + 10 cm + x = 42

x = 14 cm

s = Perimeter/2 = 42 cm/2 = 21 cm

By Heron’s formula,

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