Question

Please say step by step

Answer 1

Answer:

2a+3a+4a=180°

9a=180°

a=20°

z=4a=4×20= 80°

Answer 2

Answer:

Let,

x=2a,y=3a,z=4a

So this structure whole angle which contains x,y and z angles this is a straight line then 180°

2a+3a+4a=180

or,9a=180

.:a=20

The value of z is 4×20=80°

It is your answer.