if the area of an equilateral triangle is 81 cube 3cm^2.find its perimeter.
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Answer:
=54cm. Therefore, the perimeter of the equilateral triangle is 54 cm
Step-by-step explanation:
Area of equilateral triangle = root 3 a^2
81 root 3 = root 3/4 a^2
1/4 a^2 = 81 root 3 / root 3
1/4 *a^2 = 81
a^2 = 81*4
a ^2 = 324
a = root 324
a = 18cm
Perimeter of triangle = 3*a
= 3*18
= 54 cm
Therefore, the perimeter of the equilateral triangle is 54 cm.
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