Let Δ be the area of a triangle. Find the area of a triangle whose each side is twice the side of the given triangle.
When each side of triangle = a
When 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]
A’ = 
where 
[Heron’s Formula]
When each side of triangle = 2a
= 
= 2
A’ = 
A’ = 
= 4
= 4A
8