Geometry. BD is tangent to circle O at C, mAEC=280, and mACE=80. Find mDCE.(The figure is not drawn to scale.)
A. 100
B. 50
C. 120
D. 60
![Geometry BD is tangent to circle O at C mAEC280 and mACE80 Find mDCEThe figure is not drawn to scale A 100 B 50 C 120 D 60 class=](https://us-static.z-dn.net/files/d86/15081cb113c186e614391bd3579f6815.png)