West Bengal Board Class 9 Math Solution Chapter 18 - Area of Circular Region

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.

Suhana will draw a circle of which perimeter will be 35.2 cm. Let us see by calculating what length of radius Suhana takes to draw a circle and what will be the area of that circular field.

Grandmother of Rekha was made a circular table cover of which area 5544 sq.cm. She wants to paste coloring tape surrounding this circular cover of the table, let us see by calculating how long coloring tape she will buy.

The cost of fencing of our village play ground with railing is Rs. 924 at the rate of Rs. 21 per meter. Let us write by calculating how much sq. meter canvas will be bought for covering the field.

Faruk will draw a circle of which area will be 616 sq. meter. Let us see by calculating what length of radius Faruk will take to draw a circle and what perimeter he will get.

Palash and Piyali have drawn two circles the ratio of which length of radius is 4:5. Let us write by calculating the ratio of the area of two circular fields drawn by them.

Sumit and Reba have taken two cupper wire having same length. Sumit bent the wire in the form of a rectangular shape of which length and breadth are 48 cm. and 40 cm. But Reba bent the copper wire with same length in the form of a circle. Let us see by calculating which will cover maximum place between the rectangle drawn by Sumit and circle drawn by Reba.

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.

Anwar bibi has spent Rs. 2664 at the rate of Rs. 18.50 per meter for fencing of her semicircular land. Let us write by calculating how much cost it will take, if she makes the semicircular land plough at the rate of Rs. 32 per sq. meter.