Advertisements
Advertisements
प्रश्न
The area of a circle is 1386 sq.cm; find its circumference.
Advertisements
उत्तर
Area of circle = 1386 cm2
πr2 = 1386
`22/7r^2 = 1386`
`r^2 = 1386 xx 7/22`
`r^2 = 441`
r = `sqrt(441)`
r = 21 cm
circumference = `2pir`
= `2 xx 22/7 xx 21`
= 132 cm
APPEARS IN
संबंधित प्रश्न
Find the area of the following circle, given that diameter = 49 m.
AB is a chord of a circle with centre O and radius 4 cm. AB is of length 4 cm. Find the area of the sector of the circle formed by chord AB.
A rectangular park is 100 m by 50 m. It is surrounding by semi-circular flower beds all round. Find the cost of levelling the semi-circular flower beds at 60 paise per square metre (use π = 3.14).
If the circumference of two circles are in the ratio 2 : 3, what is the ratio of their areas?
What is the area of a square inscribed in a circle of diameter p cm ?
If π is taken as `22/7` the distance (in metres) covered by a wheel of diameter 35 cm, in one revolution, is
The radii of two circles are 8 cm and 6 cm. Find the radius of the circle having area equal to the sum of the areas of the two circles.
The following figure shows a square cardboard ABCD of side 28 cm. Four identical circles of the largest possible sizes are cut from this card as shown below.
Find the area of the remaining card-board.
The radii of two circles are in the ratio 5 : 8. If the difference between their areas is 156p cm2, find the area of the bigger circle.
The area (in cm2) of the circle that can be inscribed in a square of side 8 cm is ____________.
