find the perimeter of this triangle

Perimeter = Sum of all sides
Sides of triangle are
Now , Calculating perimeter
Perimeter = 9 + 12 + 15
Perimeter = 36 in
Answer:
P = 36 in
Step-by-step explanation:
A+B+C=P
So A would be 9,B would be 12, And C would be 15 add that all up and you get 36.