Answer :

**To find : Area of the triangle****Given: ****Two sides of the triangle are 18 cm and 10 cm (Given)**

**Perimeter of the triangle = 42 cm**

Let the third side of triangle be x, so

x + 18 + 10 = 42

Third side of triangle, x = 42 – (18 + 10)

= 14 cm

Semi perimeter of triangle(s) =

= 21cm

Using Heron’s formula,

Area of the triangle =

=

=

=

= cm^{2}

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