Advertisements
Advertisements
प्रश्न
A wire of length 1320 cm is made into circular frames of radius 7 cm each. How many frames can be made?
Advertisements
उत्तर
Length of the wire = 1320 cm
Radius of each circular frame = 7 cm
Circumference of the frame 2πr units = `2 xx 22/7 xx 7 "cm"`
= 2 × 22
= 44 cm
∴ Number of frames made = `"length of the wire"/"circumference of one frame"`
= `1320/44`
= 30
30 frames can be made.
APPEARS IN
संबंधित प्रश्न
In Fig. 6, find the area of the shaded region, enclosed between two concentric circles of radii 7 cm and 14 cm where ∠AOC = 40°. (use `pi = 22/7`)
The circumference of two circles are in ratio 2:3. Find the ratio of their areas
The radius of a sector of a circle is 7 cm. If the measure of the arc of the sector is - three right angles; find the area of the sector in case.
The area of a circle inscribed in an equilateral triangle is 154 cm2. Find the perimeter of the triangle.
The circumference of a garden roller is 280 cm. How many revolutions does it make in moving 490 meters?
Two circles touch each other externally. The sum of their areas is 5811 cm2 and the distance between their centres is 10 cm. Find the radii of the two circles.
The circumferences of two circles are in the ratio 5: 7, find the ratio between their radius.
Complete the table below.
| Radius (r) | Diameter (d) | Circumference (c) |
| ...... | ...... | 72.6 cm |
Find the radius and area of the circle which has circumference equal to the sum of circumferences of the two circles of radii 3 cm and 4 cm respectively.
Find the perimeter of the given shape (Take π = `22/7`).
