Question

I'll upload pictures

Answer 1

Find similar triangles

Triangle PQS is similar to triangle PSR

Reason for this similarity is

RS/ PS = PS / QS

In consecuence

PS^2 = RS • QS

PART 3

RS = 4, RQ= 16. Find RP

Then

RP ^2 = RQ • RS

RP = √ (4•16) = 8