Advertisements
Advertisements
प्रश्न
The radius of two circles are in the ratio 3 : 5, find the ratio between their circumferences.
Advertisements
उत्तर
The ratio of the radius of the circles = 3 : 5
Let the radius of the first circle = 3x
and radius of the second circle = 5x
∴ Circumference of the first circle = 2πr
= 2π × 3x = 6πx
and circumference of the second circle = 2πr
= 2π × 5x = 10x
∴ The ratio between their circumference
= 6πx : 10πx
= 6 : 10
= 3 : 5
APPEARS IN
संबंधित प्रश्न
A car has wheels which are 80 cm in diameter. How many complete revolutions does each wheel make in 10 minutes when the car is travelling at a speed of 66 km per hour ?
The side of a square is 10 cm. find the area of circumscribed and inscribed circles.
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
In circle of radius 6cm, chord of length 10 cm makes an angle of 110° at the centre of circle find Area of the circle
The circumference of a circle is 39.6 cm. Find its area.
In the given figure, ABCD is a trapezium of area 24.5 cm2 , If AD || BC, ∠DAB = 90°, AD = 10 cm, BC = 4 cm and ABE is quadrant of a circle, then find the area of the shaded region.
The area of an equilateral triangle is `49sqrt(3)` cm2 . Taking each angular point as centre, circles are drawn with radius equal to half the length of the side of the triangle. Find the area of the triangle not included in the circles. [Take π = 1.73]
Find the curved surface area , the total surface area and the volume of a cone if its :
Height = 8 cm , diameter = 12 cm
Find the diameter of the sphere for the following :
Surface Area = `576pi`cm2
A bucket is raised from a well by means of a rope wound round a wheel of diameter 35 cm. If the bucket ascends in 2 minutes with a uniform speed of 1.1 m per sec, calculate the number of complete revolutions the wheel makes in raising the bucket.
