Question

in triangle ABC ,if angle a-angle b=42degrees and angle b-angle c=21 degrees.find angle b​

Answer 1

Answer is 53

Step-by-step explanation:

Given that

a-b=42°

b-c=21°

angle sum property

a+b+c=180°.....1

a=42+b

c=b-21

putting value of a. and c in equation 1

42+b+b+b-21=180°

3b=180-21

3b=159°

b=159/3

b=53°answer