MAHARASHTRA Class 10: Construction of Tangents Videos | Tangent problems

The centre of a circle can be found from a point of intersection of the perpendicular bisectors of two chords. 

The angle drawn in a semicircle from the end points of the diameter is 90°. 

In ∆AXO, 

∠XAO = 25°

then ∠XOA = 180° − 90° − 25° = 65° ∠XOY = 130° 

Two tangents drawn from the external points to a circle are equal.