Question

the perimeter of a triangle is 22 cm if its two sides measure 9cm and 6cm find the length of the third side

Answer 1

perimeter of triangle=sum of all sides, so

Let the unknown side be x

22 = 9 + 6 + x
22 = 15 + x
22-15=x
7=x
x=7

so the third side is 7 cm

Answer 2

Answer:

Step-by-step explanation:

Perimeter of triangle = 22cm

1st side = 9cm

2nd side = 6cm

3rd side = ?

#perimeter = 1st side + 2nd side + 3rd side

22 = 9 + 6 + 3rd side

22 = 15 + 3rd side

22 - 15 = 3rd side

7cm = 3rd side

therefore the length of third side is 7cm