If the two circles are cut each other, then their common chord is..

The two circles touch each other if

Let two circles having radii r_(1) and r_(2) are orthogonal to each other. If the length of their common chord is k times the square root of harmonic mean between the squares of their radii, then k^(4) is equal to

Two circles with same radius r intersect each other and one passes through the centre of the other. Then the length of the common chord is

Two circles with same radius r intersect each other and one passes through the centre of the other. Then the length of the common chord is

Can two isothermal curves cut each other