Question

If the area of an equilateral triangle is 81√3 cm², then it’s height is ?

Answer 1

Step-by-step explanation:

area of equilateral triangle= √3 a² / 4 = 81 √3

a² = 81 / 4

so, a = 9/2

also, area of triangle = ½ x base x height

81√3 = ½ x 9/2 x height

so, height = 12√3 cm

PLEASE MARK AS BRAINIEST

Answer 2

Step-by-step explanation:

area of equilateral triangle = 81√3

√3a×a = 81√3

4

√3 get cancel on both side

a×a=81×4

a= √324

a=18

'A' is the side of the equilateral triangle

remaining will be in the photo