Question

Could someone help me with this?
Pretty urgent!
Having my exam tomorrow!!!​

Answer 1

arc ABC subtends angle APC at circle and 100° at centre

so, angle APC=1/2 x 100 =50°

now PABC is a cyclic quadrilateral

so, angle APC+angleABC=180°

SO, angle ABC=180-50=130°

AND , angle ABC+angleCBD=180° as they are on straight line

so angle CBD = 180-130=50°

Answer 2

answer=50. for solution refer to image