RS Aggarwal - Mathematics

Book: RS Aggarwal - Mathematics

Chapter: 12. Circles

Subject: Maths - Class 10th

Q. No. 40 of Multiple Choice Questions (MCQ)

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40

In the given figure, O is the center of a circle, AB is a chord and AT is the tangent at A. If AOB = 100° then BAT is equal to

In AOB


OA = OB [radii of same circle]


OBA = OAB [Angles opposite to equal sides are equal]


Also, By Triangle sum Property


AOB + OBA + OAB = 180°


100 + OAB + OAB = 180°


2 OAB = 90°


OAB = 40°


As AT is tangent to given circle,


We have,


OA AT


[Tangents drawn at a point on circle is perpendicular to the radius through point of contact]


So, OAT = 90°


OAB + BAT = 90°


40° + BAT = 90°


BAT = 50°

40

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