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प्रश्न
In the adjoining figure the radius of a circle with centre C is 6 cm, line AB is a tangent at A. What is the measure of ∠CAB? Why?
योग
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उत्तर
Line AB is the tangent to the circle with centre C and radius AC. ......[Given]
∴ ∠CAB = 90° ......(i) [Tangent theorem]
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