If the arcs of the same length in two circles subtend angles `65^@ and 110^@` at their respective centres. Find the ratio of their radii.

If in two circles, arcs of the same length subtend angles 60^@ and 75^@ at the centre, find the ratio of their radii.

The area of a circle is equal to the sum of the areas of the two circles, whose radii are 5 cm and 12 cm respectively. Find the radius of the circle.

In a circle of radius 21 cm, an arc subtends an angle of 60^@ at the centre. Find the length of the arc

Find the radius of the circle if length of the arc is 4pi cm and angle made by the arc at the centre is 40^@ . Find the area of the sector made by the arc.

In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. Find : the length of the arc

Find the length of an arc of circle of radius 6cm subtending an angle of 15^(@) at the centre.

In a circle of a radius 7 cm, an arc subtends an angle of 60^(@) at the centre. Find : the length of the arc

Two chords AB and AC of a circle subtend angles equal to 90^@ and 150^@ , respectively at the centre. Find angleBAC , if AB and AC lie on the opposite sides of the centre.

In the circle of 5cm.radius, what is the length of the arc which subtends and angle of 33^(@)15' at the centre.

Equal chords of a circle subtend equal angles at the centre.