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Distance of a Half Pipe

TRIG-JGV4ED

A half pipe used by skaters is made of $2$ quarter circles with radius $10$ feet and a flat part in the middle of $15$ feet as show in the diagram:

How far does a skater go from the top of one ramp to the top of the other?

A

$25.0$ ft

B

$29.8$ ft

C

$30.7$ ft

D

$40.6$ ft

E

$46.4$ ft