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Mathematics 7 Online
OpenStudy (anonymous):

In the diagram of cicle 0, chord CD is parallel to diameter AOB and m(arch)AC= 30 what is m(arch)CD?

hero (hero):

Try drawing the diagram. There's a drawing button below.

OpenStudy (anonymous):

|dw:1326756039933:dw| sorry for the terrible drawing

hero (hero):

Arc AOB = 180 Arc AC = 30 Arc DB = 30 Arc (AC + DB) = 60 Arc CD = 180 - 60 = 120

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