Advertisements
Advertisements
प्रश्न
The circumference of a circle is eigth time the circumference of the circle with a radius of 12 cm. Find its diameter.
उत्तर
Let the radius of the bigger circle = R, and Let the radius of the smaller circle = r.
r = 12 cm
According to the problem,
2πR = 8 × 2πr
2πR = 8 × 2π × 12
R = `(8 xx 2pi xx 12)/(2pi)`
R = 8 × 12
R = 96
Diameter = 2 × 96
= 192 cm
APPEARS IN
संबंधित प्रश्न
In the given figure, ∆ ABC is a right-angled triangle in which ∠ A is 90°. Semicircles are drawn on AB, AC and BC as diameters. Find the area of the shaded region
The parallel sides of trapezium are 12 cm and 9cm and the distance between them is 8 cm. Find the area of the trapezium.
In the given figure, from a rectangular region ABCD with AB = 20 cm, a right triangle AED with AE = 9 cm and DE = 12 cm, is cut off. On the other end, taking BC as diameter, a semicircle is added on outside' the region. Find the area of the shaded region. [Use π = 3.14]
Find the area and perimeter of the circle with the following :
Diameter = 77 cm
A wire bent in the form of an equilateral triangle has an area of 121 `sqrt 3` cm2. If the same wire is bent into the form of a circle , find the area enclosed by the wire.
Find the area and perimeter of the following sector :
Radius= 6 cm, angle at the centre is 70°
Find the volume and the surface area of the spheres in the following :
Radius= 2.1 cm
AC and BD are two perpendicular diameter of a circle ABCD. Given that the area of shaded portion is 308 cm2 calculate:
(i) The length of AC and
(ii) The circumference of circle
The circumference of a circle exceeds its diameter by 450 cm. Find the area of the circle.
The numerical value of the area of a circle is greater than the numerical value of its circumference. Is this statement true? Why?
