# Concentric Circles With Angle of 1 °

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“If AOB is an angle of 1 ° on the larger circle, it is also 1 ° on the smaller concentric circle, and the length of the arc AB is to the length of the arc CD as to radius OB is to the radius OD; or, arc AB:arc CD = OB:OD.”

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Trigonometry: Circles### Source

International Correspondence Schools *I.C.S. Reference Library Mathematics* (Scranton: International Textbook Company, 1905) Geometry & Trigonometry Pg. 20

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