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Easy

Question

# Find the area of an isosceles triangle whose equal sides are of length 15 cm each and third side is 12 cm.

Hint:

### Use Heron’s formula

## The correct answer is: 18√21 cm2

### It is given that a = 15 cm , b = 15 cm , c = 12 cm

Using Heron’s formula,

Area of triangle = where s =

s = = 21

Area of triangle =

=

=

So, area of isosceles triangle =

NOTE – We can use direct formula of area of isosceles triangle = where a is an equal side and b is base of triangle

a = 15 cm , b = 12 cm

Area of isosceles triangle =

=

= 6

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