Solve the problem below. 65° 115° 33° 51°

Arc ACD = 310
minor arc AD = 360 - (arc ACD)
minor arc AD = 360 - 310
minor arc AD = 50 degrees

Use the inscribed angle theorem to find that 
angle ABD = (1/2)*(minor arc AD)
angle ABD = (1/2)*50
angle ABD = 25 degrees

Focus only on triangle ABD. We have a right angle at point A. So A = 90 degrees. B = 25 was found earlier (when we computed angle ABD). We just need angle D

A+B+D = 180
D = 180-A-B
D = 180-90-25
D = 65

Or as a shortcut, 
D = 90-B
D = 90-25
D = 65
This shortcut works only because triangle ABD is a right triangle (angle B and angle D are complementary angles)

Angle ADB is 65 degrees

The coordinates of point a right now is (-3,-1) you have to multiply these coordinates by a factor of 2 to get (-6,-2)

Add up all the sides