If the radius of a rolling circle is r and radius of a direct circle is R. And R = kr and K is a rational number p/q, how many cusps does the epicycloid?

If the radius of a rolling circle is r and radius of a direct circle

1.	If the radius of a rolling circle is r and radius of a direct circle is R. And R = kr and K is a rational number p/q, how many cusps does the epicycloid?
A.	R-r
B.	q
C.	p
D.	r/k
Answer» D. r/k

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If the radius of a rolling circle is r and radius of a direct circle is R. And R = kr and K is a rational number p/q, how many cusps does the epicycloid?

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