Question

Q18. The perimeter of an equilateral
triangle is 60 m. The area is​

Answer 1

Answer:

Area of an equilateral triangle of side a = √3/4 a2

According to the question,

Perimeter of triangle = 60m

$\sf \pink \implies \purple{a + a + a = 60}$

$\sf \purple\implies \pink{3a = 60}$

$\sf \blue\implies \green{⇒ a = 20m}$

Area of the triangle = (√3/4)

$\sf\green\implies \blue{a2 = (√3/4)}$

$\sf\red\implies \orange{(20)2 = (√3/4)}$

$\sf\orange\implies \red{(400) = 100√3}$

Answer 2

$\huge\sf\underline\purple{Required Answer:-}$

$\huge\sf\underline\green{Concept used}$

In e equilateral triangle all three sides are equal

In a equilateral triangle area=$\frac{root3}{4} a²$

$\huge\sf\underline\blue{Solution}$

Given,

Perimeter is 60m

3a=60

a=20

Area is $\frac{root3}{4} 20²$=100root3

If u r unable to understand once refer attachment