If two sides of a triangle are 18 cm and 10cm and its perimeter is 42 cm , then find its third side: Question If two sides of a triangle are 18 cm and 10cm and its perimeter is 42 cm , then find its third side: in progress 0 Math Abigail 2 months 2021-11-28T13:12:55+00:00 2021-11-28T13:12:55+00:00 2 Answers 0 views 0

## Answers ( )

Answer:14 cm

Step-by-step explanation:perimeter of triangle = Sum of all three sides

let the 3rd side be x

42= 18+10+x

42=28+x

42-28=x

14=x

Therefore, the 3rd side is 14 cm.

Answer:14 is the answer of 3rd side