Question

Q. The side of an equilateral triangle is 5 cm its area is :

A) 12.5cm^2
B) 2 5 under root 3 cm^2
C)25 under root 3
- - - - - - - - - - - - cm^2
4
D)15 cm^2

Answer 1

since it is equilateral triangle all sides are equal therefore

area of triangle equal to- 1/2*base*height

so

12.5 cm^2

Answer 2

Answer:

let's found its area by herons formula

we get s=7.5

now by substituting this in formula we get area as 18.75 root 2.5