Question

in figure lines AB and CD interset at O if angle AOD angle DOC= 4:5 then find angle COB​

Answer 1

Step-by-step explanation:

Let ∠AOD=4x and ∠DOB=5x

∠AOD+∠DOB=180

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(Adjacent angle on straight line are supplementary)

⇒4x+5x=180

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⇒9x=180

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⇒x=

9

180

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=20

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∠AOD=4x

⇒∠AOD=4×20

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=80

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Now ∠COB=∠AOD (vertically opposite angles)

⇒∠COB=80

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Answer 2

Answer:

80 degree

Step-by-step explanation:

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