As shown in the figure, a, P, B and C are four points on the circle O, angle APC = angle CPB = 60 degrees. Judge the shape of triangle ABC and prove it

As shown in the figure, a, P, B and C are four points on the circle O, angle APC = angle CPB = 60 degrees. Judge the shape of triangle ABC and prove it

Angle APC = angle CPB = 60 degrees, are you sure you write it correctly? Draw a picture, point a and point B are coincident!