Ho w d o t h i s p l e a s e h a l p m e h

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15

Are triangles the congruent? write the congruency statement.what is the congruency that proves they are congruent? what is the perimeter of ∆pqr?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)