If AB, BC and CD are equal chords of a circle with O as a centre and AD diameter, than ∠AOB =

One chord of a circle is known to be 10 cm. The radius of this circle must be

ABC is a triangle with B as right angle, AC=5 cm and AB = 4 cm. A circle is drawn with A as centre and AC as radius. The length of the chord of this circle passing through C and B is

Let C be the mid-point of an arc AB of a circle such that m=183°. If the region bounded by the arc ACB and line segment AB is denoted by S, then the centre O of the circle lies

In a circle, the major arc is 3 times the minor arc. The corresponding central angles and the degree measures of two arcs are