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NotSoSmart  Mar 31, 2017
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A central angle intercepting the same arc as an incribed angle has twice the measure of the inscribed angle....

 

And "O"  is a central angle intercepting the same minor arc, QN,  as inscribed angle "R"

 

So..."O"  measures twice "R"   = 2 * 28   =  56°

 

 

cool cool cool

CPhill  Mar 31, 2017

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