Geometry

[rigid glen]

CM=DM=AB/2=4√3

Also <DMC=2*<CBD=2*45=90

Therefore CM=DM=4√3 and <DMC=225. Those completely define the triangle CMD therefore you can calculate everything about it.

[ruby owl]

yeah mb i should probably close it since i solved it

also dmc is 90

not 225

[rigid glen]

Yeah my bad CBD is 45 not 360- 135. DMC is 360-2*135=360-270=90.

[abstract dock]

+close