Advertisements
Advertisements
प्रश्न
The radius of a circle is 21 cm. Find the circumference (Take π = `3 1/7`).
उत्तर
Given, radius (r) = 21 cm and π =`22/7`
Circumference of the circle = 2πr
= `2xx22/7xx21` cm
= 2 × 22 × 3 cm
= 132 cm
APPEARS IN
संबंधित प्रश्न
Shazli took a wire of length 44 cm and bent it into the shape of a circle. Find the radius of that circle. Also find its area. If the same wire is bent into the shape of a square, what will be the length of each of its sides? Which figure encloses more area, the circle or the square? (Take `pi = 22/7`)
The side of a square is 10 cm. find the area of circumscribed and inscribed circles.
The diameters of the front and rear wheels of a tractor are 80 cm and 2 m respectively. Find the number of revolutions that a rear wheel makes to cover the distance which the front wheel covers is 800 revolutions.
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.
Sum of the areas of two squares is 157 m2. If the sum of their perimeters is 68 m, find the sides of the two squares.
Complete the table below.
| Radius (r) | Diameter (d) | Circumference (c) |
| ...... | ...... | 616 cm |
The cost of fencing a circular field at the rate of Rs.250 per metre is Rs.55000. The field is to be ploughing at the rate of Rs.15 per m2. Find the cost of ploughing the field.
Is it true that the distance travelled by a circular wheel of diameter d cm in one revolution is 2 π d cm? Why?
A wire is bent to form a square of side 22 cm. If the wire is rebent to form a circle, its radius is ______.
Area of circular garden with diameter 8 m is ______.
