alleryAt A on a circle centred O, the tangent makes 50° with chord AB. ∠OAB?
A25°
B65°
C40°
D50°
Answer & Solution
Correct answer: C. 40°
The inward radius is perpendicular to the tangent, giving ∠OAB=90°−50°=40°.
Keep practising Geometry: Similarity, Circles & Loci
Browse all Geometry: Similarity, Circles & Loci questions for ICSE Class 10, or explore more Mathematics topics.
Related questions
Match each circle tangent theorem with its geometric property:Match each circle intersection feature with its name:Match each cyclic quadrilateral property with its rule:Match each tangent calculation with its result:In a nondegenerate triangle, its incircle's centre must lieWhich condition verifies a constructed circle is a triangle's incircle?Set the compass point at a triangle's circumcentre. Which opening draws its circumcircle?Where is a right triangle's circumcentre?