Question

The height of an equilateral triangle is 6 cm, then find its area

Answer 1

h=√3a/2
a=2h/√3
=2×6/√3=12/√3=6.92cm
a=6.92cm
area of equilateral triangle is√3asquare/4
√3×(6.92)square/4= 20.76m square

Answer 2

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Given

The height of an equilateral triangle is 6 cm.

Find

The area of equilateral triangle.

SOLUTION

As, given triangle is equilateral

$AB=BC=AC=a$

$Also, BD=\frac{1}{2}BC=\frac{a}{2}$

In a right angled triangle ADB

$AD^2+BD^2=AB^2$

$6^2+(\frac{a}{2})$

$⇒ 36=\frac{3a^2}{4}$

on simplifying we get

$a^2=36\times \frac{4}{3}$

$=48$

∴ Area of equilateral triangle is

$=\frac{\sqrt3}{4}\times a^2=\frac{\sqrt3}{4}\times</p><p> 48$

$=12\sqrt3cm^2$

HOPE IT HELPS!!