Advertisements
Advertisements
प्रश्न
Find the circumferences of a circle whose radius is 7 cm.
Advertisements
उत्तर
Radius of the circle, r = 7 cm
∴ Circumference of the circle =
APPEARS IN
संबंधित प्रश्न
In Fig. 3, APB and AQO are semicircles, and AO = OB. If the perimeter of the figure is 40 cm, find the area of the shaded region [Use `pi=22/7`]
The circumference of a circle exceeds the diameter by 16.8 cm. Find the radius of the circle.
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
Shazli took a wire of length 44 cm and bent it into the shape of a circle. Find the radius of that circle. Also find its area. If the same wire is bent into the shape of a square, what will be the length of each of its sides? Which figure encloses more area, the circle or the square? (Take `pi = 22/7`)
The hypotenuse of a right-angled triangle is 65 cm and its base is 60 cm. Find the length of perpendicular and the area of the triangle.
The radius of a sector of a circle is 7 cm. If the measure of the arc of the sector is 210°, find the area of the sector in case.
Choose the correct alternative answer for the following question.
Find the diameter of the circle whose area is equal to the sum of the areas of two circles having radii 4 cm and 3 cm.
A horse is placed for grazing inside a rectangular field 70 m by 52 m. It is tethered to one corner by a rope 21 m long. On how much area can it graze? How much area is left ungrazed?
Diameter of the circular garden is 42 m. There is a 3.5 m wide road around the garden. Find the area of the road.
The circumference of a garden roller is 280 cm. How many revolutions does it make in moving 490 meters?
In Figure 2, two concentric circles with centre O, have radii 21 cm and 42 cm. If ∠AOB = 60°, find the area of the shaded region.
The perimeter of a square and the circumference of a circle are equal. If the length of each side of the square is 22 cm, find:
(i) perimeter of the square.
(ii) circumference of the circle.
(iii) radius of the circle.
Each side of a square is 44 cm. Find its perimeter. If this perimeter is equal to the circumference of a circle, find the radius of the circle.
A wire bent in the form of an equilateral triangle has an area of `121sqrt(3)"cm"^2`. If the same wire is bent into the form of a circle, find the area enclosed by the wire.
Diameters of different circles are given below. Find their circumference (Take π = `22/7`)
d = 28 mm
A race track is in the form of a circular ring whose outer and inner circumferences are 396 m and 352 m respectively. The width of the track is ____________.
Circumferences of two circles are equal. Is it necessary that their areas be equal? Why?
Circumference of a circle of diameter 5 cm is ______.
Ratio of the circumference of a circle to its diameter is denoted by symbol ______.
