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OpenStudy (anonymous):
DG←→ and EG←→ are tangent to circle C and circle F. The points of tangency are A, B, D, and E. If m∠DFE = 140°, what is m∠ACB?http://cdn.ple.platoweb.com/PCAP-ASSETS-PROD/dd15801366274def92626b0f4c65b95f
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OpenStudy (anonymous):
angle ACB=140 deg. why? triangle FGD has angles 140/2+90=160 so angle FGD=20 triangle CGA has angles 20+90 =110 so remaining angle =70 by symmetry angle ACB=2*70=140 deg.
OpenStudy (anonymous):
140 degrees.
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