Question

if the area of an equilateral triangle is 81 root 3 cm square find its perimeter​

Answer 1

Answer:

Step-by-step explanation:

are of Equilateral triangle =√3/4 a²

Given are = 81√3cm

Therefore

√3/4a²=81√3

Solving,

a²=81×4

a=18cm

Perimeter of equilateral triangle =3a

=3×18=54cm

Answer 2

area is given: 81√3

so we can say ,

√3/4×a^2 =81√3, where a= side of Triangle

so,

a^2=(81√3×4)/√3

a^2= 81×4

a=18cm

now perimeter of Triangle = 3× side

perimeter=3×18

perimeter = 54cm

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