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Mathematics 20 Online
OpenStudy (anonymous):

if DEF = 97, calculate DBF.

OpenStudy (anonymous):

OpenStudy (anonymous):

quadrilateral => interior angle sum is 360 angle BDE = angle BFE = 90 DEF = 97 so 360 - 90 - 90 - 97 = DBF

OpenStudy (anonymous):

thansk!

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