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Let's say I have,

enter image description here

Now I have to find the angle CBA. Given that we know just 26 given above.

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    $\begingroup$ Think about the measure of $ACB$ $\endgroup$ – user261263 Dec 3 '16 at 11:06
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Hint: $\angle ACB$ is 90 degrees because AB is the diameter of the circle.

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$\angle CAB=26$ and $AB$ is a diameter hence $\angle ACB=90$.

So $\angle CBA=180-(90+26)=64$.

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  • $\begingroup$ Very neat, +1... $\endgroup$ – I am Back Dec 4 '16 at 8:15

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