Advertisements
Advertisements
प्रश्न
The circumference of a circle exceeds its diameter by 45 cm. Find the circumference of the circle.
उत्तर
Let the radius of the circle be r.
Now,
Circumference = Diameter + 45
⇒ 2πr = 2r + 45
⇒ 2πr - 2r = 45
`⇒ 2"r" (22/7 - 1) = 45`
`=> 2"r"xx15/7 = 45`
⇒ r = 10.5 cm
∴ Circumference = Diameter + 45 = 2(10.5) + 45 = 66 cm
Hence, the circumference of the circle is 66 cm.
APPEARS IN
संबंधित प्रश्न
The minute hand of a clock is √21 𝑐𝑚 long. Find area described by the minute hand on the face of clock between 7 am and 7:05 am
The circumferences of two circles are in the ratio 2: 3. What is the ratio between their areas?
Two circular pieces of equal radii and maximum area, touching each other are cut out from a rectangular cardboard of dimensions 14 cm ⨯ 7 cm. Find the area of the remaining cardboard.
The circumference of a circle is equal to the sum of the circumference of two circles having diameters 36 cm and 20 cm. The radius of the new circle is
Find the area enclosed between two concentric cirdes of radii 6.3 cm and 8.4 cm. A third concentric circle is drawn outside the 8.4 cm circle, so that the area enclosed between it and 8.4 cm cirde is the same as that between two inner circles. Find the radii of the third circle correct to two decimal places .
A solid sphere metal is cut through its centre into 2 equal parts. If the diameter of the sphere is 3`1/3` cm , find the total surface of each part, correct to two decimal places.
The radii of two circles are 25 cm and 18 cm. Find the radius of the circle which has a circumference equal to the sum of circumferences of these two circles.
Complete the table below.
| Radius (r) | Diameter (d) | Circumference (c) |
| ...... | ...... | 72.6 cm |
A wheel of a car covers a distance of 3520 cm in 20 rotations. Find the radius of the wheel?
