If O is the centre of a circle with radius r and AB is a chord of the circle at a distance `r/2` from O, then `/_BAO=`

Construct a circle with centre O and radius 4 cm.

In the adjoining figure, O is the centre of the circle. If the chord AB is equal to the radius of the circle, then find the value of angleADB .

P Q is a tangent drawn from a point P to a circle with centre O and Q O R is a diameter of the circle such that /_P O R=120o , then /_O P Q is 60o (b) 45o (c) 30o (d) 90o

(i) Find the length of a chord which is at a distance of 12 cm from the centre of a circle of radius 13cm. (ii) The length of a chord is 16 cm of a circle of diameter 2 cm. find the perpendicular distance of this chord from the centre of the circle.

O is the centre of a circle of diameter AB. If chord AC= chord BC, then find the value of angleABC .

In the adjoining figure, O is the centre of the centre of the circle. If diameter AC=26cm and chord AB=10cm, then find the distances of the chord AB from the centre of the circle.

In the figure given below, O is the centre of the circle. AB and CD are two chords of the circle. OM is perpendicular to AB and ON is perpendicular to CD. AB = 24 cm, OM = 5 cm, ON = 12 cm. Find the : (i) radius of the circle (ii) length of chord CD

In the adjoining figure O is the centre of circle and c is the mid point. the radius of circle is 17 cm . if OC=8cm, then find the length of chord AB.

Two chords AB and CD of a circle are each at distances 4 cm from the centre. Then,

If a chord AB subtends and angle of 60^(@) at the centre of a circle, then the angle between the tangents to the circle drawn from A and B is