All the diameters of a circle are ......... to each other.

All concentric circles are..... to each other.

In Fig. 15.69, A B and C D are two diameters of a circle perpendicular to each other and O D is the diameter of the smaller circle. If O A=7\ c m , find the area of the shaded region. (FIGURE)

If two diameters of a circle intersect each other at right angles,then quadrilateral formed by joining their end points is a rhombus (b) rectangle (c) parallelogram (d) square

Two diameters of a circle intersect each other at right angles.Prove that the quadrilateral formed by joining their end-points is a square.

In the figure given below, D is the diameter of each circle. What is the diameter of the shaded circle ?

Prove that, if a diameter of a circle bisects two chords of the circle then those two chords are parallel to each other.

If one end of the diameter of a circle is (3, 4) which touches the x-axis then the locus of other end of the diameter of the circle is

If a diameter of a circle bisects each of the two chords of a circle,prove that the chords are parallel.

If a diameter of a circle bisects each of the two chords of a circle,prove that the chords are parallel.