Question

The perimeter of an isosceles triangle is
19cm . One of the two equal sides is 7cm . Find the third side

Answer 1

perimeter of isosceles triangle = 2a

Answer 2

Given that:

In an isosceles triangle.

• Its perimeter is 19 cm.
• One of its equal sides is 7 cm.

To Find:

• The third side of the isosceles triangle.

Let us assume:

• The third side of the isosceles triangle be x.

Formula used:

In an isosceles triangle.

• Perimeter = 2(Equal sides) + Third side

According to the question.

ㅤ↠ㅤ19 = 2(7) + x

ㅤ↠ㅤ19 = 14 + x

ㅤ↠ㅤx = 19 - 14

ㅤ↠ㅤx = 5

Hence,

• The third side of the isosceles triangle is 5 cm.