In the diagram, what is the perimeter of $\triangle PQS$?
The perimeter of triangle PQS is 76.
Check your figures again; the perimeter is not 76.
QP = 12
QS = 35
SP = 37
The perimeter is the total of the three sides.
Use Pythagoras' Theorem to find PQ: PQ2 = 132 – 52
Once you've found the value of PQ
Use Pythagoras' Theorem to find QS: QS2 = 372 – PQ2
Now you have all three sides. Add them up.
Post back if you don't know how to do square root stuff.