Advertisements
Advertisements
Question
Find the area and perimeter of the circles with following: Radius = 10.5cm
Advertisements
Solution
The Area of a Circle with radius r = πr2
∴ The Area of a Circle with radius 10.5cm
= π(10.5)2
= `(22)/(7)(10.5)^2`
= 346.5cm2
The Circumference of a Circle with radius r = 2πr
The Circumference of a Circle with radius 10.5
= 2π(10.5)
= `2 xx (22)/(7)(10.5)`
= 66cm.
APPEARS IN
RELATED QUESTIONS
In circle of radius 6cm, chord of length 10 cm makes an angle of 110° at the centre of circle find The area of sector
The area of a minor sector of a circle is 3.85 cm2 and the measure of its central angle is 36°. Find the radius of the circle.
Choose the correct alternative answer for the following question.
OACB is a quadrant of a circle with centre O and its radius is 3.5 cm. If OD = 2 cm. find the area of
- quadrant OACB
- the shaded region.
Find the volume and the surface area of the spheres in the following :
Radius= 2.1 cm
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.
Complete the table below.
| Radius (r) | Diameter (d) | Circumference (c) |
| ...... | 28 cm | ...... |
Diameters of different circles are given below. Find their circumference (Take π = `22/7`)
d = 56 m
Find the circumference of the circles whose radii are given below.
91 mm
Circumferences of two circles are equal. Is it necessary that their areas be equal? Why?
