Maths-

General

Easy

Question

# In the following figure the value of a b, respectively ...................

- 70°,65°
- 50°,75°
- 45°,60°
- 60°,75°

## The correct answer is: 60°,75°

### 3x+4x+5x = 180

12x =180 (supplementary angles )

x=180/12

x=15 degree

Also 4x+3x+b=180 (supplementary angles)

7x+b =180

b=180-7*15

b=180-105

b=75

And also ,

3x+b+a=180 (supplementary angles)

15*3+75+a=180

120+a=180

a=60

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