Question

.Find the area of an equilateral triangle with side 9 cm by

Heron’s formula​

Answer 1

Answer:

The area of an equilateral triangle= a^2(√3/4)

the side that's a=9cm

so, therefore,

=9^2(√3/4)

=(81√3)/4

=35.07

Answer 2

Question:

Find the area of an equilateral triangle with side 9 cm by  Heron’s formula​.

To find:

$\to$Find the area of an equilateral triangle

Given:

• The each side of an equilateral triangle=9cm

Solution:

$\to$($\sqrt{\frac{3 * 9^{2} }{4} }$)$cm^{2}$

$\to$=($\sqrt \frac{3 * 9 * 9}{4}$)$cm^{2}$

$\to$=35.07$cm^{2}$(approx)

Used formula:

$\to$The area of an equilateral triangle=$\sqrt \frac{3 * side^{2} }{4}$

Answer:

The area of an equilateral triangle with side 9cm=35.07$cm^{2}$(approx)