Find the area of an isosceles triangle having the base x cm and one side y cm.
In ∆ABC, AB = 
………………….Given
Since 
, 
and 
are the sides of an isosceles triangle and s is
the semi-perimeter, then its area is given by:
A = 
where 
[Heron’s Formula]
= 
A= 
A = 
= 
cm2
3