Question

Please explain it with steps
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Answer 1

Answer:

2a+a+90=180'

3a=90'

a=30'(angle sum is equals to 180)

b+2a=180'(angles on a straight line is equals to 180')

b+2(30)=180'(because as we know that a=30')

b+60'=180'

b=140'

c+a=180'(angles on a straight line is equals to 180')

c+30=180'

c=150'

Here is your answer and I hope it is helpful.

Answer 2

Step-by-step explanation:

sum of all angles of triangle = 180°

the angle at the top as we can see is 90°

so the sum of 2a and a is 180-90=120°

2a+a = 3a

3a= 120°

a=120/3

so

angle a = 40°

angle 2a = 80°