If radii of two concentric circles are 4 cm and 5 cm then the length of each chord of one circle which is tangent to the other circle.

From a point P which is at a distance 13 cm from the center O of the circle of radius 5 cm, the pair of tangents PQ and PR are drawn, Find the area of quadrilateral PQOR in cm.

If two tangents inclined at 60^o are drawn to a circle of radius 3 cm , then the length of each tangent is 3/.

If a chord AB subtends an angle 60^o at the center , then angle between tangents at A and B is also 60^o.

The length of tangent from an external point P to a circle with centre O is always less than OP.

If a number of circles passes through the end points of line segment PQ. Then the centres of all circles lie on the perpendicular bisector of PQ.

Out of two concentric circles, the radius of outer circle is 5 cm and the chord AC of length 8 cm of outer circle touches the inner circle, then the radius of inner circle is

Two tangents PQ and PR are drawn from an external point P to a circle with centre 0. then quadrilateral PQOR is _______

AB is diameter of a circle and AC is its chord such that  = 30^o. If tangent at C intersects extended AB at D .then,

 If tangents PA and PB from a point P to a circle with centre O are inclined to each other at an angle of 80° then \(\angle \)POA is equal to