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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=180-715
b=180-105
b=75
And also ,
3x+b+a=180 (supplementary angles)
153+75+a=180
120+a=180
a=60

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