Q. 84.5( 8 Votes )

# 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.

Answer :

Given, the field is rectangular in shape with length (l) = 60m and breadth (b) = 42m

In the center lies a circular pool with radius (r) = 14m

Since grass is planted within the field we will calculate area of the rectangular field

Area of rectangular field = l × b = 60 × 42 where l and b are length and breadth of rectangular field, respectively.

= 2520 m^{2}

Area of circular pool = πr^{2} where r is the radius of circular pool

=

= 616 m^{2}

The grass will be planted in the area = Area of rectangular field - Area of circular pool

= 2520 – 616 = 1904 m^{2}

Cost of planting grass per meter is Rs75/ m^{2} = area of field × rate of planting per sq. meter

= 1904 × 75 = Rs 1,42, 800

Rate this question :

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

West Bengal MathematicsThe ratio of the area of an equilateral triangle inscribing a circle is

West Bengal MathematicsRabeya 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.

West Bengal MathematicsThree 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.

West Bengal Mathematics