Question

Prove that - angle ACB=ADB=90°

Answer 1

AB is a common arc of angleACB and

angle ADB.

so,angle ACB=angle ADB.

since,

AB is straight line.

so,

angle o =180.

since,

angle o is centre angle.

since,

we know that centre angle is double then

remaining part of angle of circle.

so,

angle ABC =angle ADB=90.