Real `pi` is defined as the ratio of the circumference (say c) of a circle to its diameter (say d) i.e `pi=(c )/(d)` this seems to contradict the fact that `pi` is irrational how will you resolve this contradication ?

Let 'C' be the circle with centre (0,0 ) and radius 3 units. The equation of the locus of the mid points of chords of the circle 'C' that subtend an angle of 2pi//3 at its centre is:

The diameter of a circle is a line which joins two points on the circle and also passes through the centre of the circle. (In the adjoining figure (Fig 11.12) AB is a diameter of the circle, C is its centre.) Express the diameter of the circle (d) in terms of its radius (r).

If two of the zeros of a cubic polynomial ax^(3) + bx^(2) + cx + d are each equal to zero, find the third zero. What can you say of c and d ?