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In the figure below, two circular curves...

In the figure below, two circular curves create `60^(@) and 90^(@)` with their respectively centers. If the length of the bottom curve y is `10pi`. Find the length of the other curve. Who is equal x?

A

`(9pi)/(sqrt(2))`

B

`15pi`

C

`9pi`

D

`(15pi)/(sqrt(2))`

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