O is the circumcentre of . If , , then  is equal to

If discount of 10% is given on the marked price of a radio, the gain is 20%. If the discount is increased to 20%, the gain is

• 

• 5%

• 
• 

3.

O is the centre of  and , then the measure of  is

• 125°

• 100°

• 130°

• 115°

AB and CD are two parallel chords of a circle lying on the opposite side of the centre and the distance between them is 17cm. The length of AB and CD are 10 cm and 24 cm, respectively. The radius (in cm) of the circle is

• 13

• 9

• 18

• 18

In the given figure, O is the centre, Then x, is equal to

AC is a chord of circle whose centre is at O. If B is any point on the arc AC and , then the magnitude of   is

Two equal arcs of the two circles subtend angle of  and  at the centre. The ratio of the radii of the two circles is

An angle in a semicircle is 

A chord of length 16 cm is drawn in a circle of radius 10 cm. The distance of the chord from the centre of the circle is

• 8 cm

• 6 cm

• 4 cm

• 12 cm

In a circle with centre O, AB is a diameter and CD is a chord which is equal to the radius OC. AC and BD are extended in such a way that they intersect each other at a point P, exterior to the circle. The measure of ∠APB is

• 30°

• 45°

• 60°

• 60°