Question

The semi- perimeter of an Isosceles triangle is 20. Equal sides of an Isosceles triangle is 15 cm. What is the length of the 3rd side of the triangle​

Answer 1

The measure of 3rd side is 10 centimetres

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Answer 2

Given :- The semi- perimeter of an Isosceles triangle is 20. Equal sides of an Isosceles triangle is 15 cm.

To find :-

What is the length of the 3rd side of the triangle.

Solution :-

Let the 3rd side be x .

Given semi-perimeter = 20cm.

Then , perimeter = 20×2 = 40cm.

We know , perimeter is sum of all sides .

➝Perimeter = 15+15+x .

➝40 = 30 + x

➝x = 10cm

Hence , the 3rd side is 10cm .

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