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Mathematics 8 Online
OpenStudy (anonymous):

Anyone know how to answer this questions please help me. in the diagram below, O is circumscribed about quadrilateral DEFG. What is the value of x? http://assets.openstudy.com/updates/attachments/53c9b8f0e4b081ba9637cf55-shayday345-1405729589107-66febcfca8ae410fb80effdbddbc2de4.gif

OpenStudy (xapproachesinfinity):

opposite sides of inscribed quadrilateral are supplementary meaning they sum up to 180

OpenStudy (xapproachesinfinity):

so \[120+(x-10)=180 ~~ \text{solve for x }\]

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