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Mathematics 8 Online
zarkam21 (zarkam21):

Help please, will medal

zarkam21 (zarkam21):

OpenStudy (mjdennis):

Here is the approach I would use: The angle in the center is 72°. How many degrees in a full circle? The proportion of your angle to a full circle is the same as the proportion of your arc to the full circumference of the circle.

zarkam21 (zarkam21):

um 180

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