Advertisements
Advertisements
Question
The radius of a circle is 7 cm. find the circumference of the circle.
Advertisements
Solution
Given radius of a circle r = 7cm
Circumference of a circle = 2πr
`= 2 xx (22/7) xx 7`
= 2 × 22
= 44cm
APPEARS IN
RELATED QUESTIONS
In Fig. 4, O is the centre of a circle such that diameter AB = 13 cm and AC = 12 cm. BC is joined. Find the area of the shaded region. (Take π = 3.14)
In Fig. 4, ABCD is a square of side 14 cm. Semi-circles are drawn with each side of square as diameter. Find the area of the shaded region.
(use `pi=22/7`)
ABC is an isosceles right-angled triangle with ∠ABC = 90°. A semi-circle is drawn with AC as the diameter. If AB = BC = 7 cm, find the area of the shaded region. [Take π = 22/7]
Four equal circles each of radius a, touch each other. Show that area between them is `6/7a^2`
Find the area of a right-angled triangle, the radius of whose circumference measures 8 cm and the altitude drawn to the hypotenuse measures 6 cm.
The radius of a sector of a circle is 7 cm. If the measure of the arc of the sector is - three right angles; find the area of the sector in case.
Choose the correct alternative answer for the following question.
The circumference of a circle is 22 cm. Find the area of its quadrant.
Find the length of the arc of a circle of diameter 42 cm which subtends an angle of 60° at the centre.
Find the perimeter of the shaded region in the figure, if ABCD is a square of side 14 cm and APB and CPD are semicircles.
The side of a square is 10 cm. Find the area of the circumscribed circle. [Take π = 3.14.]
Four equal circles are described about the four corners of a square so that each touches two of the others, as shown in the figure. Find the area of the shaded region, if each side of the square measures 14 cm.
Find the curved surface area , the total surface area and the volume of a cone if its :
Height = 15 cm , radius = 8 cm
A 7 m road surrounds a circular garden whose area is 5544 m2. Find the area of the road and the cost of tarring it at the rate of Rs.150 per sq m.
A bucket is raised from a well by means of a rope which is wound round a wheel of diameter 77 cm. Given that the ascends in 1 minute 28 seconds with a uniform speed of 1.1 m/sec, calculate the number of complete revolutions the wheel makes in raising the bucket. (Take π =22/7)
The radius of a circular garden is 56 m. What would it cost to put a 4-round fence around this garden at a rate of 40 rupees per metre?
The radius of a circular plot is 7.7 metres. How much will it cost to fence the plot with 3 rounds of wire at the rate of 50 rupees per metre?
A wire of length 1320 cm is made into circular frames of radius 7 cm each. How many frames can be made?
If the circumference of a circle is 352 metres, then its area in square metres is ____________.
Ishika has designed a small oval race track for her remote control car. Her design is shown in the figure. What is the total distance around the track? Round your answer to the nearest whole cm.
