Question

In figure 9, If angle BAC = 60°angle ACB = 20°find angle ADC.​

Answer 1

Answer:

80

Step-by-step explanation:

In abc

A+b+c=180

60+b+20=180

b=180-80

b=100

In cyclic Quadrilateral

B+D=180

100+D=180

D=180-100

D=80

Answer 2

Answer:

Here angle BAC=60° and Angle ACB=20°

Step-by-step explanation:

In ∆ABC by angle sum property

60°+20°+angle ABC =180°

80°+ABC=180°

ABC=180°-80°

ABC=100°

Now in quadrilateral ABCD

as it is a cyclic quadrilateral

100°+ADC=180°

ADC=80°

Hope it will help u