Question

If the side of equilateral triangle is 10.5 cm Find the perimeter

Answer 1

The perimeter of the equilateral triangle = 31.5 cm

Given :

The side of equilateral triangle is 10.5 cm

To find :

The perimeter of the equilateral triangle

Solution :

Step 1 of 2 :

Write down the side of the equilateral triangle

Here it is given that side of the equilateral triangle is 10.5 cm

Step 2 of 2 :

Find perimeter of the equilateral triangle

We know that in study of geometry an equilateral triangle is defined as a triangle whose all three sides are of equal length.

The perimeter of the equilateral triangle

= 3 × Side of the equilateral triangle

= 3 × 10.5 cm

= 31.5 cm

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Answer 2

The perimeter of the equilateral triangle is  $=31.5 \mathrm{~cm}$

Perimeter

Since all the sides of an equilateral triangle are equal in length, the perimeter can be easily calculated with the length of one of its sides. This value can be substituted in the formula for the perimeter of an equilateral triangle, P = 3 × a; where 'a' is the side length of the triangle.

Given :

The side of equilateral triangle is $10.5 \mathrm{~cm}$

Step by step solution

The perimeter of the equilateral triangle=$3a$

where 'a' side length

It is given that side of the equilateral triangle is $10.5 \mathrm{~cm}$

Solution

The perimeter of the equilateral triangle

$=3 \times$ Side of the equilateral triangle

Substitute the value

$=3 \times 10.5 \mathrm{~cm}$

$=31.5 \mathrm{~cm}$

Hence the perimeter of the equilateral triangle is  $=31.5 \mathrm{~cm}$

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