Question

in the, qiuen circular figure if angle BAC is 60 and angle bca is 20 degree
find angle ADC please explain step bystep​

Answer 1

Angle AOC + Angle AOB = 180 (linear pair)

if angle AOB = 60

than Angle AOC = 180 - 60 = 120 Degree

if know heard about the half angle theorem or else if you know about the theorem in which the angle in the semi-circle is 90 degree , than in Triangle ABC which is in a semi-circle as BC is a diameter, So angle BAC = 90 degree

If you heard about the half- angle theorem than ACB = half(angle AOB) = 30 degree

So in Triangle ABC

BAC = 90 Degree

ACB = 30 Degree,

than Angle ABC = 60 (sum of the angles of the triangle is 180)

@krishhhhhhna