Question

solve this question, Circles class 10 mathematics

Answer 1

this is your answer
ask if any doubt?

Answer 2

Answer:

angle cba=70 degree

Step-by-step explanation:

<PCB+<BCO+<OCA = 110............................eqn 1

<PCB+<BCO = 90.........................................eqn 2(radius OC perpendicular to PC)

<BCO+<OCA = 90.......................................eqn 3(angle subtented in a semicircle)

From eqn 1&2;<OCA =110 - 90=20 degree

In eqn 2; <BCO+<OCA = 90

                          <BCO =90 - 20 = 70 degree

OC = OB (radii of circle)

therefore;<BCO = <CBA

                 <CBA = 70 degree