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Mathematics 9 Online
OpenStudy (anonymous):

What is the best way of solving these types of questions m∠1 = _° https://banff.owschools.com/media/g_geo_2013/7/group146.gif

OpenStudy (mathmate):

Use the secant theorem: If two secants AB and DC meet at E outside a circle, angle E equals half the difference of the arcs AD and BC |dw:1407007094493:dw| you can apply this directly to your problem.

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