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In the given diagram O is the centre of ...

In the given diagram O is the centre of the circle and CD is a tangent. `angleCAB` and `angleACD` are supplementary to each other `angleQAC=30^@`. Find the value of `angleOCB`.

A

`30^@`

B

`20^@`

C

`60^@`

D

none of these

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The correct Answer is:
To solve the problem, we need to find the value of angle OCB given the information provided. Here’s a step-by-step solution: ### Step 1: Identify the angles and their relationships We know that: - Angle CAB and angle ACD are supplementary, meaning their sum is 180 degrees. - Angle QAC is given as 30 degrees.
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