Answer:
.
Explanation:
1. Create an expression.
Using the fact that the perimeter of a triangle is just the sum of the lengh of all its sides, then the expression "
" is the result of adding up all the sides of this triangle. Then, if we have 2 of the 3 sides, the resulting side must measure the difference between the perimeter and the sum of the 2 given sides.This is how to write it:
; c is the given name for the third side.
2. Simplify the expression.
3. Express the result.
.