New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    Let C be a circle with centre O and P be an external

    point to C. Let PA and PB be two tangents to C with A and B being the points of tangency, respectively. If PA and PB are inclined to each other at an angle of 60°, then find∠POA.
    A 40° Correct Answer Incorrect Answer
    B 60° Correct Answer Incorrect Answer
    C 80° Correct Answer Incorrect Answer
    D 30° Correct Answer Incorrect Answer

    Solution

    Let  C  be a circle with center  O  and  P  be an external point.   PA  and  PB  are tangents from  P  to the circle, with  A  and  B  being the points of tangency. The angle between the tangents PA & PB is given as 60°. The angle between the radii OA and OB (subtended by the tangents at the center) is 2 x the angle between the tangents, So, angle AOB = 2 x 60° = 120°. The angle POA (half of angle AOB) is 60°, as the tangents subtend equal angles at the center. 

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