Question

perimeter of a triangle is 36 cm. find the third side if the two sides are 9 cm and 12 cm respectively.​

Answer 1

Step-by-step explanation:

Perimeter is sum of length of all sides.

Therefore, 36= x +9+12 (x is length of unknown side)

x= 15cm

Thus the length of unknown side is 15cm.

Answer 2

Answer:

hi. ......... .....!

Step-by-step explanation:

Your Answer-

1. First Side - 9
2. Second Side - 12
3. Let

The Third Side - x

Perimeter of Triangle -36

Sum of All Side - 36

9 + 12 + x = 36

21 + x = 36

x = 36 - 21

x = 15

So The Third Side is 15