Advertisements
Advertisements
प्रश्न
Find the area of a circular field that has a circumference of 396m.
Advertisements
उत्तर
The Circumference of a Circle with radius r = 2πr
Here, Circumference of a Circle = 369
⇒ 2πr = 396
⇒ r = `(396)/(2pi)`
= `(396 xx 7)/(2 xx 22)`
= 63m
The Area of a Circle with radius r = πr2
⇒ The Area of a Circle with radius 63m
= π(63)2
= `(22)/(7) xx (63)^2`
= `(22)/(7) xx 3969`
= 12,474m2.
APPEARS IN
संबंधित प्रश्न
The perimeter of a sector of a circle of radius 5.2 cm is 16.4 cm. Find the area of the sector.
A brooch is made with silver wire in the form of a circle with diameter 35 mm. The wire also used in making 5 diameters which divide the circle into 10 equal sectors as shown in Fig. Find:
(i) the total length of the silver wire required
(ii) the area of each sector of the brooch
Find the circumference of a circle whose area is 301.84 cm2.
The area of rhombus is `480cm^2` , and one of its diagonal measures 48 cm. Find
(i) the length of the other diagonal,
(ii) the length of each of the sides
(iii) its perimeter
Find the curved surface area , the total surface area and the volume of a cone if its :
Height = 15 cm , radius = 8 cm
The area of a circular ring enclosed between two concentric circles is 88 cm 2. Find the radii of the two circles, if their difference is 1 cm.
A wire bent in the form of an equilateral triangle has an area of 121 `sqrt 3` cm2. If the same wire is bent into the form of a circle , find the area enclosed by the wire.
Complete the table below.
| Radius (r) | Diameter (d) | Circumference (c) |
| ...... | ...... | 616 cm |
Find the area and perimeter of the circles with following: Radius = 2.8cm
A circular pond is 17.5 m is of diameter. It is surrounded by a 2 m wide path. Find the cost of constructing the path at the rate of Rs 25 per m2.
