Solve this :

7. In the given figure, circles (O, r) & (O', R) touches each other at P. Prove that OO' is a straight line.

Dear student
Yes you can do that.Also refer the same link for the same.
https://www.meritnation.com/ask-answer/question/circles-o-r-o-is-the-centre-r-is-the-radius-and-o-p/circles/586169
Regards

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Yes you can
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Consider the tangent at point P.
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by measuring the angle of mid point of touching both circles
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What are you looking for?