Question

the side an equilateral triangle is 18cm.find its area
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Answer 1

Step-by-step explanation:

area of equilateral triangle= 18*18=324

there fore area of equilateral triangle= 324

Answer 2

Answer:

The area of the equilateral triangle = 81$\sqrt{3}$cm²

Step-by-step explanation:

Given,

Side of an equilateral triangle = 18cm

To find,

The area of the triangle

Recall the formula

Area of an equilateral triangle = $\frac{\sqrt{3} }{4} a^2$, where a is the length of the side of the triangle

Solution:

Given side of the triangle = a = 18cm

Area =  $\frac{\sqrt{3} }{4} a^2$ =   $\frac{\sqrt{3} }{4} X18^2$ = 81$\sqrt{3}$cm²

∴The area of the equilateral triangle = 81$\sqrt{3}$cm²

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