`A B` and `C D` are two common tangents to circles which touch each other at `C` . If `D` lies on `A B` such that `C D` =4cm, then `A B` is equal to (a) 4cm (b) 6cm (c) 8cm (d) 12cm

AB and CD are two common tangents to circles which touch each other at C. If D lies on AB such that CD=4cm, then AB is equal to (a) 4cm(b)6cm(c)8cm(d)12cm

In Figure, If DE // B C , then x equals. (a)6cm (b) 8cm (c) 10cm (d) 12.5

In Figure, the perimeter of A B C is (a) 30cm (b) 60cm (c) 45cm (d) 15cm

In the figure, if DF||BC, AD = 3cm, BD = 4cm and BC = 14cm, then DE equals (a) 7cm (b) 6cm (c) 4cm (d) 3cm

Two concentric circles of radii 3 cm and 5 cm are given. Then length of chord B C which touches the inner circle at P is equal to (a) 4 cm (b) 6cm (c) 8 cm (d) 10 cm

In Figure, two equal circles touch each other at T , if Q P=4. 5 c m , then Q R= (a) 9cm (b) 18cm (c) 15cm (d) 13.5cm

At one end A of a diameter A B of a circle of radius 5cm, tangent X A Y is drawn to the circle. The length of chord C D parallel to X Y and at a distance of 8cm from A is (a) 5cm (b) 6cm (c) 7cm (d) 8cm

A B C P Q R such that a r( A B C)=4a r( P Q R)dot If B C=12 c m , then Q R= (a) 9cm (b) 10cm (c) 6cm (d) 8cm

If the area of a sector of a circle bounded by an arc of length 5pi cm is equal to 20pi\ c m^2 , then its radius is (a) 12 cm (b) 16 cm (c) 8 cm (d) 10 cm

If the area of a sector of a circle bounded by an arc of length 5pi cm is equal to 20pi\ c m^2 , then its radius is (a) 12 cm (b) 16 cm (c) 8 cm (d) 10 cm