What is the measure of the base of a triangle that has side lengths of 3 m and 2 m and a perimeter of 9 m?

The perimeter of a triangle is the sum of its three sides.

If two are 3m and 2m then their sum is 3m + 2m = 5m

And the remaining side can be calculated by taking this sum from the perimeter

→ the other side is 9m - 5m = 4m long.