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CBSE Class 9 Answered

In fig., if y = 20°, prove that the line AOB is a straight line.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

We know angle at a point is 360o.

y+3x-15+y+5+2y+4y+10+x=360o

8y + 4x = 360o

160o + 4x = 360o (Since, y=20o)

4x = 200 x= 50o

Now, we have:

y + 5 + 3x - 15 + y = 40 + 150 - 10 = 180o

AOB is a straight line.

Answered by | 04 Jun, 2014, 03:23: PM

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