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explain please.

 Mar 8, 2018
 #1
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For inscribed quadrilaterals, opposite angles are supplementary. 
By setting the measures of B plus D equal to 180, we solve for x.
\(x+24+x+10=180\\ x=73\) 
You use this x value to plug into x+15 (measure of angle A).
Opposite angles are supplementary so you subtract the measure of angle A you just calculated from 180 to get the measure of angle C. 

\(x+15\\ 73+15=88\\ 180-88=92\)

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 Mar 8, 2018
 #2
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90 degrees?

 Mar 8, 2018

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