Advertisements
Advertisements
Question
The circumference of a circle is 39.6 cm. Find its area.
Solution
Circumference = 39.6 cm
We know:
Circumference of a circle = 2πr
`=> 39.6 = 2 xx 22/7xx"r"`
`=>(39.6xx7)/(2xx22) = r`
⇒ r = 6.3 cm
Also,
Area of the circle = πr2
`=22/7xx6.3xx6.3`
= 124.74 cm2
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)
The hypotenuse of a right-angled triangle is 65 cm and its base is 60 cm. Find the length of perpendicular and the area of the triangle.
Choose the correct alternative answer for the following question.
The curved surface area of a cylinder is 440 cm 2 and its radius is 5 cm. Find its height.
The wheel of a motor cycle is of radius 35 cm. How many revolutions per minute must the wheel make so as to keep a speed of 66 km/hr ?
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`)
Find the area of a circular field that has a circumference of 396m.
Sudhanshu divides a circular disc of radius 7 cm in two equal parts. What is the perimeter of each semicircular shape disc? (Use π = `22/7`)
A wire of length 1320 cm is made into circular frames of radius 7 cm each. How many frames can be made?
The distance around a circle is its ______.
Ratio of circumference of a circle to its radius is always 2π:I.
