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In given figure XY and X’ Y’ are two parallel tangents to a circle with centre O and another tangent AB with point of contact C intersecting XY at A and X’ Y’ at B. Prove that ∠AOB = 90°.
Download Sample Paper of Class 10 here https://www.teachoo.com/cbse/sample-papers/
This is exactly same as Ex 10.2, 9.