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Trigonometry Ferris Wheel Question

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I'm having trouble with the following question:

Let P be a point on the wheel (which has a diameter of 100 m). The wheel starts with P at the lowest point, at ground level. The wheel rotates at a constant rate, in an anticlockwise (counterclockwise) direction. One revolution takes 20 minutes.

What would be the height of P above ground level after 15 minutes?

 

Thank you 

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Draw the Ferris wheel at time t = 0, with P at the bottom. Draw another wheel, showing location of P, for t = 20 minutes. Then repeat for t = 10 minutes, and find the height of P. Finally, draw the wheel at t = 15 minutes and find the height of P.

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