Question

Two sides of a triangle are 8 cm and 12 cm. Find the measure of third side, if the perimeter of the triangle is 31 cm.​

Answer 1

Answer:

The third side of the triangle will be 11 cm

Step-by-step explanation:

Here the perimeter of the triangle is given to be 31 cm

Also, two sides of the triangle is given to be 8 cm and 12 cm

We have to find the third side

Let the third side be x

perimeter of a triangle = sum of all three side

                                31 = 8 + 12 + x

                                31 = 20 + x

                                 x = 31 - 20

                                 x = 11 cm