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 figure, ΔABC is an isosceles triangle with perimeter 44 cm. The base BC is of length 12 cm. Side AB and side AC are congruent. A circle touches the three sides as shown in the figure below. Find the length of the tangent segment from A to the circle.
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)
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 pendulum swings through an angle of 30º and describes an arc 8.8 cm in length. Find the length of the pendulum.
Find the circumference of the circle with the following radius: (Take `bb(pi = 22/7`)
28 mm
In circle of radius 6cm, chord of length 10 cm makes an angle of 110° at the centre of circle find Length of arc
In the given figure, O is the centre of the sector. \[\angle\]ROQ = \[\angle\]MON = 60° . OR = 7 cm, and OM = 21 cm. Find the lengths of arc RXQ and arc MYN. (\[\pi = \frac{22}{7}\])
A wire when bent in the form of an equilateral triangle encloses an area of `121sqrt(3) "cm"^2`. The same wire is bent to form a circle. Find the area enclosed by the circle.
In the given figure, OPQR is a rhombus, three of whose vertices lie on a circle with centre O. If the area of the rhombus is `32sqrt(3)`, find the radius of the circle.
The area of a circle is 38.5 cm2. The circumference of the circle is
The radii of two concentric circles are 19 cm and 16 cm respectively. The area of the ring enclosed by these circles is
A hollow metallic cylindrical tube has an internal radius of 3.5 cm and height 21 cm. The thickness of the metal tube is 0.5 cm. The tube is melted and cast into a right circular cone of height 7 cm. Find the radius of the cone, correct to one decimal place.
Find the diameter of the sphere for the following :
Volume = `72pi "cm"^3`
An express train is running between two stations with a uniform speed. If the diameter of each wheel of the train is 42 cm and each wheel makes 1200 revolutions per minute, find the speed of the train.
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 inner circumference of a circular track is 264 m and the width of the track is 7 m. Find:
(i) the radius of the inner track.
(ii) the radius of the outer circumference.
(iii) the length of the outer circumference.
(iv) the cost of fencing the outer circumference at the rate of ₹50 per m.
Find the area and perimeter of the circles with following: Radius = 2.8cm
The sum of the circumference and diameter of a circle is 176 cm. Find the area of the circle.
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 diameter of a wheel is 1.26 m. The distance traveled in 500 revolutions is ____________.
