Advertisements
Advertisements
प्रश्न
The radius of a circle is 7 cm. find the circumference of the circle.
Advertisements
उत्तर
Given radius of a circle r = 7cm
Circumference of a circle = 2πr
`= 2 xx (22/7) xx 7`
= 2 × 22
= 44cm
APPEARS IN
संबंधित प्रश्न
A wire is looped in the form of a circle of radius 28 cm. It is re-bent into a square form. Determine the length of the side of the square.
A sector is cut from a circle of radius 21 cm. The angle of the sector is 150º. Find the length of its arc and area.
The perimeter of a sector of a circle of radius 5.2 cm is 16.4 cm. Find the area of the sector.
A steel wire when bent is the form of square encloses an area of 12 cm2. If the same wire is bent in form of circle. Find the area of circle.
The sum of the radii of two circles is 140 cm and the difference of their circumferences in 88 cm. Find the diameters of the circles.
Find the angle subtended at the centre of circle of radius 5cm by an arc of length `((5pi)/3)` cm
Choose the correct alternative answer for the following question.
Find the length of the arc of a circle of diameter 42 cm which subtends an angle of 60° at the centre.
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 conical tent requires 264 m2 of canvas. If the slant height is 12 m, find the vertical height of the cone.
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.
Find the area and perimeter of the following semi-circle :
Radius= 1.4 cm
Find the diameter of the sphere for the following :
Volume = `72pi "cm"^3`
Find the diameter of the sphere for the following :
Surface Area = `576pi`cm2
Construct an angle PQR = 45°. Mark a point S on QR such that QS = 4.5 cm. Construct a circle to touch PQ at Q and also to pass through S.
In the adjoining figure, the radius is 3.5 cm. Find:
(i) The area of the quarter of the circle correct to one decimal place.
(ii) The perimeter of the quarter of the circle correct to one decimal place. ( Take π = `22/7`)
Complete the table below.
| Radius (r) | Diameter (d) | Circumference (c) |
| 7 cm | ...... | ...... |
Complete the table below.
| Radius (r) | Diameter (d) | Circumference (c) |
| ...... | ...... | 72.6 cm |
The diameter of a circle is 5.6 cm. Find its circumference.
The area of a circle whose circumference is 22 cm, is ____________.
