Today the cow of Amina bibi is fastened to a post with a rope of length 2.1 meter in the vacant field. Let us see by calculating how much maximum area the cow will graze.

The inner diameter and external diameter of an Iron ring plate are 20 cm and 22 cm. The quality of iron plate in the ring is

At the centre of rectangular field of Pioneer atheletic club there is a circular Pool of which length of radius is 14 meter. The length and breadth of rectangular field are 60 meter and 42 meter respectively. Let us see by calculating how much cost it will take for planting grass of remaining place of rectangular field except pool at the rate of Rs. 75 per square meter.

A 7 meter wide path runs outside a circular park of Etalgacha Friends association club along perimeter. Let us write by calculating the area of path, if the perimeter of circular park is 352 meter, let us write by calculating how much cost for concreting the path at the rate of Rs. 20 per square meter.

The ratio of the area of an equilateral triangle inscribing a circle is

Dinesh has made a pie-chart of the students of their class who want to play which game. He has taken length of radius of circle 3.5 cm, let us write by calculating the perimeter and area of each sector of circles.

Rabeya drew an equilateral triangle with sides 21 cm. on a big paper. Drawing a circle inscribing that triangle coloured the circular region. I write by calculating the area of coloured region.

Let us write by calculating the length of radius of incircle and circumcircle of a triangle of which sides are 20 cm, 15 cm, 25 cm. Let us calculate the area of the regions bounded by incricle and circum-circle.

Three circular plate were cut off from a tin plate with equal width if the ratio of length of diameter of three circles is 3:5:7, let us see by calculating the ratio of their weight.

The area of circular field is 154 sq cm. Let us write by calculating the perimeter and area of circumference circular field with square.

Let us calculate the area of a circular region circumscribe a triangle of which sides are 3 cm, 4 cm and 5 cm.