Problem: In a mall, a shopper rides up an escalator between floors. At the top of the escalator, the shopper turns right and walks 12.79 m to a store. The magnitude of the shopper's displacement from the bottom of the escalator to the store is 16.0 m. The vertical distance between the floors is 4.51 m.
Part A: At what angle is the escalator inclined above the horizontal?
Please do a step by step solution since I'm kind of lost with this problem. Thanks.