Me plz cuz my crazy teacher will yell at me again

Acable car begins its trip by moving up a hill. as it moves up, it gains elevation at a constant rate of 50 feet/minute until it reaches the peak at 2,000 feet. then, as the car moves down to the hill’s base, its elevation drops at the same rate.

Solve the triangle. a = 21°, c = 105°, c = 5

Can someone tell me if this is perpendicular? !