From a point Q, the length of the tangent to a circle is 24 cm and the distance of Q from the centre is 25 cm. Then, the radius of the circle is
7 cm
12 cm
15 cm
24.5 cm
PA and PB are two tangents drawn to a circle from a point P outside the circle. If PA = 5 cm and ∠APB = 60o, then the length of AB is
5 cm
6 cm
8 cm
If tangents PA and PB from a point P to a circle with centre O are inclined to each other at angle of 80o, then ∠POA is.
50o
60o
70o
80o
In figure, three circles centres A, B, C respectively touch each other externally. If A B = 5 cm, B C = 7 cm and CA = 6 cm then, the radius of the circle with centre A is
2 cm
3 cm
4 cm
1. 5 cm
Which one of the following may be the central angle of a minor arc
200°
180°
140°
190°
A circle has circumference 88 cm .Then its area is
626 cm2
616 cm2
656 cm2
666 cm2
Two circles of radii 4 cm and 6 cm touch each other .then distance between their centres when they internally is
If the central angle of two complementary arcs are equal then the measure of each is
360o
120o
180o
90o
Sum of the angles of cyclic quadrilateral is
270o
In two concentric circles, a chord of the larger circle touches the smaller circle. If the length of this chord is 8 cm and the diameter of the smaller circle is 6 cm then, the diameter of the larger circle is
10 cm
None of these