Question

4. In given figure,  ACD = 100

0

, Find  ABC​

Answer 1

Answer:

80°

Step-by-step explanation:

On line BD

we know that

a line is 180°

let Angle ACB is x

angle ACD + angle ACB = 180

100°+ x = 180

x = 180-100

x = 80

ACB=80°

In triangle ABC

angle BAC = 20°

Then the sum of all angles of triangle is 180°

angle BAC + angle ACB + angle ABC= 180

20 + 80 + ABC = 180

100 + ABC = 180

ABC=180-100

ABC= 80°

angle ABC is 80°