Find the circumference of the inner and the outer circles, shown in the adjoining figure? (Take `pi=3.14`)

Find the circumference of the circle whose area is 38.5 cm^2

Identify then tangent to the circle in the adjoining figure and write its name.

The circumference of a circle is 31.4cm. Find the radius and the area of the circle. (Take pi=3.14 )

The diameter of a circle is a line which joins two points on the circle and also passes through the centre of the circle. (In the adjoining figure (Fig 11.12) AB is a diameter of the circle, C is its centre.) Express the diameter of the circle (d) in terms of its radius (r).

Find the circumference of the circles with the following radius: (Take pi=22/7 ) 14cm

Find the circumference of the circles with the following radius: (Take pi=22/7 ) 28cm

Find the circumference of the circles with the following radius: (Take pi=22/7 ) 21cm

The circumference of two circles is in the ratio 2:5 , Find the ratio of their areas.

The equivalent resistance. of the arrangement of resistances shown below in the adjoining figure between the points A and B is

From a circular card sheet of radius 14cm, two circles of radius 3.5cm and a rectangle of length 3cm and breadth 1cm are removed (as shown in the adjoining figure. Find the area of the remaining sheet. (Take pi=22/7 )