Question

find the perimeter of an isosceles triangle with equal side 5 cm each and third side 7 cm​

Answer 1

$\huge{\underline{\underline{\red{\mathfrak{AnSwEr :}}}}}$

$\small{\underline{\blue{\sf{Given :}}}}$

• Triangle is Isosceles
• Sides are :5 cm, 7 cm

$\rule{200}{1}$

$\small{\underline{\green{\sf{Solution :}}}}$

We have to find Perimeter of an isosceles triangle, If two equal sides are of 5 cm and other side is 7 cm

So,

All sides are of 5cm, 5cm, 7 cm

And formula for Perimeter of Triangle is :

$\large \star {\boxed{\sf{Perimeter \: = \: Sum \: of \: Sides}}} \\ \\ : \implies {\sf{Perimeter \: = \: 5 \: + \: 5 \: + \: 7}} \\ \\ : \implies {\sf{Perimeter \: = \: 10 \: + \: 7}} \\ \\ : \implies {\sf{Perimeter \: = \: 17}} \\ \\ \Large {\boxed{\sf{Perimeter \: = \: 17 \: cm}}}$

Answer 2

Solution:

Given:

• Two equal sides of isosceles triangle = 5 cm
• Third side of isosceles triangle = 7 cm

To Find:

• Perimeter of the triangle.

Formula used:

• Perimeter of triangle = Sum of all three sides.

Now, put the values in the formula we get,

↦Perimeter of triangle = Sum of all sides

↦Perimeter of triangle = 5 + 5 + 7

↦Perimeter of triangle = 17 cm.

Hence, perimeter of the triangle = 17 cm.

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Extra Info:

What is Triangle?

• A triangle is a basic shape of geometry. It has 3 vertices and 3 sides.
• Sum of all the angles of triangle is equal to 180°.

Types of Triangle:

Basically there are three types of Triangle:

1. Scalene Triangle: In this type of triangle all sides and angles are different.
2. Isosceles Triangle: In this type of triangle two sides and angles are equal and one is different.
3. Equilateral Triangle: In this type of triangle all the sides and angles are equal.