Question

find the area of an equilateral triangle using herons formula if its side is 'a'

Answer 1

heya mate
here's your answer
hope this will be helpful to you
thanks
#puja

Answer 2

we know that ,
In equilateral triangle all side r equal .
It one side is a (given).
First find semi perimetre
(a+b+c)/2=(a+a+a)/2=3a/2 . (s-a)=(3a/2-a/1)=3a-2a/2=a/2
Using herons formula
______________________
√s (s-a) (s-b) (s-c)= 3a/2 (a/2) (a/2) (a/2)
_________________________
√3×a/2×a/2×a/2×a/2

√3×a/2×a/2=
√3a^2/4