Question

If the area of an equilateral triangle is 81 root 3 find its height

Answer 1

area of a equilateral triangle=√3a^2/4
or 81√3=√3a^2/4
or a^2=81√3×4/√3
or a=√81×4
.•.a=18

then, height of equilateral triangle=√3a/2
=18√3/2
=9√3 answer

Answer 2

See the attachment it will help you