What is the length of the radius of the circumcircle of the equilateral triangle, the length of whose side is 6√3 cm?

The length of a chord which is at a distance of 12 cm from the center of a circle of radius 13 cm is 

The length of the common chord of two intersecting circles is 24 cm. If the diameter of the circles are 30 cm and 26 cm, then the distance between the center (in cm) is 

ABCD is cyclic quadrilateral Sides AB and DC, when produced, meet at E, and sides BC and AD, When produced, meet at F. If ∠BFA=60° and ∠AED=30°, then the measure of ∠ABC is:

In the figure below, find the value of AB.

O is the incentre of ∆ABC and ∠A = 30° then ∠BOC is

Two equal circles of radius 4 cm intersect each other such that each passes through the center of the other. The length of the common chord is

The number of sides in two regular polygons are in the ratio of 5 : 4. The difference between their Interior angles of the polygon is 6⁰ . Then the number of sides are