Question

Two sides of a triangle are 12cm and 14cm. The perimeter of the triangle is 36 cm. What is its third side​

Answer 1

Answer:

Perimeter of the triangle = 36 cm

AB = 12 cm

BC = 14 cm

CA = ?

Now, the perimeter of a triangle = Sum of all its sides

⇒ 36 = 12 + 14 + CA 

⇒ 36 = 26 + CA 

⇒ CA = 36 – 26

⇒ CA = 10 cm

Therefore, the length of the third side is 10 cm.

Answer 2

• As per the data given in the question, we have to find the value of the expression.

            Given data:- Two sides of triangle $12\ cm$ and $14\ cm.$

                                 The perimeter of the triangle $36\ cm.$

            To find:- Third side of the triangle.

            Solution:-

• We know that the perimeter of a triangle is equal to the addition of all sides of the triangle.
• The Formula for the perimeter of a triangle,

            $P=A+B+C.$

            $P=A+B+C\\36=12+14+C\\36=26+C\\C=36-26\\C=10cm.$

       Hence we will get the third side of the triangle is  $C=10cm.$