Advertisements
Advertisements
प्रश्न
The cost of fencing a circular field at the rate of Rs.250 per metre is Rs.55000. The field is to be ploughing at the rate of Rs.15 per m2. Find the cost of ploughing the field.
Advertisements
उत्तर
Let the radius of the circular field = r m
⇒ Circumference of the field = 2πr m
Now, the cost of fencing the circular field at Rs.250/m = Rs.55000
⇒ 2πr x 250 = 55000
⇒ `2 xx (22)/(7) xx "r" xx 250` = 55000
⇒ r = `(55000 xx 7)/(2 xx 22 xx 250)`
= 35m
Now, the area of the field
= πr2
= `(22)/(7) xx 35 xx 35`
= 3850m2
Thus, the cost of ploughing the field at the rate of Rs.15/m2
= Rs.15 x 3850
= Rs.57750.
APPEARS IN
संबंधित प्रश्न
The side of a square is 10 cm. Find the area of the inscribed circle [π = 3.14]
PQRS is a diameter of a circle of radius 6 cm. The lengths PQ, QR and RS are equal. Semicircles are drawn with PQ and QS as diameters, as shown in the given figure. If PS = 12 cm, find the perimeter and area of the shaded region.
The perimeter of a circular field is 242 m. The area of the field is
The circumferences of two circles are in the ratio 3 : 4. The ratio of their areas is ______.
In a circle of radius 14 cm, an arc subtends an angle of 120° at the centre. If `sqrt(3) = 1.73` then the area of the segment of the circle is
Find the area and perimeter of the following semi-circle :
Radius= 1.4 cm
A cart wheel makes 9 revolutions per second. If the diameter of the wheel is 42cm, find its speed in km per hour. (Answer correct to the nearest km)
The diameter of a cycle wheel is `4(5)/(11)"cm"`. How many revolutions will it make in moving 6.3km?
A 4.2m wide road surrounds a circular plot whose circumference is 176m. Find the cost of paving the road at Rs.75per m2.
The area of a quadrant of a circle whose circumference is 22 cm, is ____________.
