Advertisements
Advertisements
प्रश्न
Find the area enclosed between two concentric circles, if their radii are 6 cm and 13 cm respectively.
उत्तर
Area between two concentric circles = Area of larger cirde - area of smaller circle
Area of the drde = πr2
Radius of bigger drde = r 1 = 13 cm
Radius of smaller drde = r 2 = 6 cm
Required area = `pi "r"1^2 - pi "r"2^2`
`= (22/7 xx 13 xx 13) - (22/7 xx 6 xx 6)`
= 531.1429 - 113.1429
= 418 cm2
Hence, required area = 418 cm2
APPEARS IN
संबंधित प्रश्न
The short and long hands of a clock are 4 cm and 6 cm long respectively. Find the sum of distances travelled by their tips in 2 days. (Take π = 22/7)
From a circular sheet of radius 4 cm, a circle of radius 3 cm is removed. Find the area of the remaining sheet. (Take π = 3.14)
The sum of the radii of two circles is 140 cm and the difference of their circumferences in 88 cm. Find the diameters of the circles.
An arc of length 15 cm subtends an angle of 45° at the centre of a circle. Find in terms of 𝜋, radius of the circle.
The minute hand of clock is10cm long. Find the area of the face of the clock described by the minute hand between 8am and 8:25 am
The shape of the cross section of a canal is a trapezium. If the canal is 10 m wide at the top, 6 m wide at the bottom and the area of its cross section is `640m^2` , find the depth of the canal.
Find the diameter of the circle whose area is equal to the sum of the areas of two circles having radii 4 cm and 3 cm.
The circumference of a circle is 8 cm. Find the area of the sector whose central angle is 72°.
The wheels of a car make 2500 revolutions in covering a distance of 4.95 km. Find the diameter of a wheel.
Diameter of the circular garden is 42 m. There is a 3.5 m wide road around the garden. Find the area of the road.
Find the curved surface area , the total surface area and the volume of a cone if its :
Height = 15 cm , radius = 8 cm
A circus tent is cylindrical to a height of 5 m and conical above it. If its diameter is 42 m and slant height of the cone is 53 m, calculate the total area of the canvas required.
The sum of the radii of two circles is 10.5 cm and the difference of their circumferences is 13. 2 cm. Find the radii of the two circles.
A metal wire, when bent in the form of an equilateral triangle of largest area, encloses an area of 484 `sqrt3` cm2. If the same wire is bent into the form of a circle of largest area, find the area of this circle.
The circumference of a circular field is 308 m. Find is:
(i) Radius
(ii) Area.
Construct an angle PQR = 45°. Mark a point S on QR such that QS = 4.5 cm. Construct a circle to touch PQ at Q and also to pass through S.
The diameter of the bullock cart wheel is 1.4 m. Find the distance covered by it in 150 rotations?
The area of a quadrant of a circle whose circumference is 22 cm, is ____________.
Areas of two circles are equal. Is it necessary that their circumferences are equal? Why?
The area of a circular playground is 22176 m2. Find the cost of fencing this ground at the rate of Rs 50 per metre.
