AD is a diameter of a circle and AB is a chord. If AD = 34 cm, AB = 30 cm, the distance of AB from the centre of the circle is

In Fig. , if OA = 5 cm, AB = 8 cm and OD is perpendicular to AB, then CD is equal to

If AB = 12 cm, BC = 16 cm and AB is perpendicular to BC, then the radius of the circle passing through the points A, B and C is :

In Fig., if ∠ABC = 20º, then ∠AOC is equal to

In Fig., if AOB is a diameter of the circle and AC = BC, then ∠CAB is equal to

If the length of a chord of a circle is 16 cm and is at a distance of 15 cm from the centre of the circle,then the radius of the circle is

The radius of a circle is 6 cm. The perpendicular distance from the centre of the circle to the chord which is 8 cm in length, is

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

ABCD is a cyclic quadrilateral such that ∠ADB = 30° and ∠DCA = 80°, then ∠DAB =

In the given figure, angles subtended by chords AC and BC at the centre O of the circle are 55o and 155orespectively. Find∠ACB

In the given figure, if PQRS is a cyclic quadrilateral with respective angles. Then, the ratio ofxand y is ____

O is the centre of the circle.∠ACB=40.then ∠AOBis

In the given figure, AB = CD = 5 cm OM = 3 cm. Then ON is ____.

In the given figure; O is the centre of the circle and ∠BDC=42o.The measure of∠BACis _____

In the given figure,∠ABD=70o,∠ADB=30o. Then, ∠BCDis ____.

PQRS is a cyclic quadrilateral such that PR is a diameter of the circle. If∠QPR=67and ∠SPR=72,then ∠QRS=____.

AD is a diameter of a circle and AB is a chord. If AD = 34 cm, AB = 30 cm then the distance of AB from the centre of the circle is ____.

One chord of a circle is known to be 10 cm. The radius of this circle must be

ABC is a triangle with B as right angle, AC = 5 cm and AB = 4 cm. A circle is drawn with A as centreand AC as radius. The length of the chord of this circle passing through C and B is