Advertisements
Advertisements
Question
Find the circumferences of a circle whose radius is 7 cm.
Advertisements
Solution
Radius of the circle, r = 7 cm
∴ Circumference of the circle =
APPEARS IN
RELATED QUESTIONS
In Fig. 7, are shown two arcs PAQ and PBQ. Arc PAQ is a part of circle with centre O and radius OP while arc PBQ is a semi-circle drawn on PQ ad diameter with centre M. If OP = PQ = 10 cm show that area of shaded region is `25(sqrt3-pi/6)cm^2`.
A race track is in the form of a ring whose inner circumference is 352 m, and the outer circumference is 396 m. Find the width of the track.
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
Given figure depicts an archery target marked with its five scoring areas from the centre outwards as Gold, Red, Blue, Black and White. The diameter of the region representing Gold score is 21 cm and each of the other bands is 10.5 cm wide. Find the area of each of the five scoring regions. [use π = 22/7]
The radii of two circles are 19 cm and 9 cm, Find the radius of the circle which has circumference equal to the sum of the circumferences of the two circles.
The circumference of a circle is 8 cm. Find the area of the sector whose central angle is 72°.
A boy is cycling in such a way that the wheels of his bicycle are making 140 revolutions per minute. If the diameter of a wheel is 60 cm, calculate the speed (in km/h) at which the boy is cycling.
In the given figure, ABCD is a trapezium of area 24.5 cm2 , If AD || BC, ∠DAB = 90°, AD = 10 cm, BC = 4 cm and ABE is quadrant of a circle, then find the area of the shaded region.
The perimeter of the quadrant of a circle is 25 cm. Find its area.
The radius of the circle is given below; find the area.
28 cm
The circumferences of two circles are in the ratio 5: 7, find the ratio between their radius.
Complete the table below.
| Radius (r) | Diameter (d) | Circumference (c) |
| 7 cm | ...... | ...... |
Diameters of different circles are given below. Find their circumference (Take π = `22/7`)
d = 70 cm
Find the circumference of the circles whose radii are given below.
91 mm
A Rose garden is in the form of circle of radius 63 m. The gardener wants to fence it at the rate of ₹ 150 per metre. Find the cost of fencing?
In the formula, C = 2πr, ‘r’ refers to
The cost of decorating the circumference of a circular lawn of a house at the rate of ₹ 55 per metre is ₹ 16940. What is the radius of the lawn?
The area of a circle whose circumference is 22 cm, is ____________.
Circumference ‘C’ of a circle can be found by multiplying diameter ‘d’ with ______.
