Question

The length of two sides of a triangle are 12cm and 15cm. if the perimeter of the
triangle is 38 cm. Find the length of it third side.​

Answer 1

Solution -

It is given that for a triangle , it's two sides are 12 cm and 15 cm respectively .

Now the perimeter of the triangle is 38 cm .

We have to find the length of the third side.

Let us assume that the third side is x cm long.

Perimeter of the triangle :

> Side 1 + Side 2 + Side 3

Hence

> 12 cm + 15 cm + x = 38 cm

> 27 cm + x = 38 cm

> x = 11 cm .

Hence , the length of the third side is 11 cm . .

This is the required answer.

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Answer 2

Answer:

Given :-

Length of two side = 12 cm and 15 cm

Perimeter = 38 cm

To Find :-

Length of thrid side

Solution :-

Let us assume the third side is c

We know that

Perimeter = a + b + c

38 = 12 + 15 + c

38 = 27 + c

38 - 27 = c

11 = c

Length of third side = 11 cm

Verification :-

38 = a + b + c

38 = 12 + 15 + 11

38 = 38

Hence, verified

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