15. In figure, lines AB and CD intersect at O. If ∠AOD : ∠DOC = 4 : 5 then find ∠COB.
Solution not provided.
Ans. 80°
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16.
An angle is equal to five times of its complement. Find the measure of the angle.
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17.In figure, lines I and m intersect each other at O. If x = 40°, then, find the values of y, z and w.
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18.If OA, OB. OC and OD are the rays such that ∠AOB = ∠COD = 150°, ∠BOC = 30° and ∠AOD = 30°. Is it true that AOC and BOD are straight lines? Justify your answer.
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19.In figure, angles x and y are supplementary angles. If ∠x = 110°, find the value of y.
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20.In figure, lines AB and CD intersect at O. If ∠AOC + ∠BOE = 70° and ∠BOD = 40°, find ∠BOE and reflex ∠COE.