Find the area of a triangle whose sides are 9 cm, 12 cm and 15 cm.
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]
= 
= 18
A = 
A = 
= 54 cm2
3
Find the area of a triangle whose sides are 9 cm, 12 cm and 15 cm.
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]
= = 18
A =
A = = 54 cm2