I need some help with this circle theorem, I understand that the line is over lapped but I can't figure the rest out.
use isoceles triangles, some of teh sides are the same because they are radii.
HOPE THIS HELPED!
The base angles of the bottom triangle are equal because they are opposite equal radii
So....the apex angle of the bottom triangle = 180 - 50 - 50 = 80°
And c is an inscribed angle intercepting the same arc as this central angle of 80°
So....c has 1/2 the measure of this angle = 40°