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CBSE Class 9 Answered

In figure, lines AB and CD intersect at O. If AOD : DOC = 4 : 5, then find COB
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

Let AOD = 4x

And, DOC = 5x

Therefore, 4x + 5x = 180o

Or, 9x = 180o

Or, x = 20o

Therefore, AOD = 4 x 20o = 80o

Now, COB = AOD (Vertically opp. angles)

COB = 80o.

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

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