Advertisements
Advertisements
Question
A wheel has a diameter of 84 cm. Find how many completer revolutions must it make to cover 3.168 km.
Advertisements
Solution
The diameter of the wheel = 84 cm
Thus, the radius of the wheel = 42 cm
Circumference of the wheel = 2 x `22/7` x 42 = 264 cm
In 264 cm, the wheel is covering one revolution.
Thus, in 3.168 km = 3.168 x 100000 cm, number of revolutions
covered by the wheel = `3.168/264 xx 100000` = 1200.
APPEARS IN
RELATED QUESTIONS
A race track is in the form of a ring whose inner circumference is 352 m, and the outer circumference is 396 m. Find the width of the track.
An arc of length 15 cm subtends an angle of 45° at the centre of a circle. Find in terms of 𝜋, radius of the circle.
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
Find the area of a right – angled triangle, the radius of whose, circumference measures 8 cm and the altitude drawn to the hypotenuse measures 6 cm.
The radius of a sector of a circle is 7 cm. If the measure of the arc of the sector is 210°, find the area of the sector in case.
A sector of 56°, cut out from a circle, contains 17.6 cm2. Find the radius of the circle.
A chord of a circle of radius 30 cm makes an angle of 60° at the centre of the circle. Find the areas of the minor major segments.
The radius of the circle is given below; find the area.
28 cm
Complete the table below.
| Radius (r) | Diameter (d) | Circumference (c) |
| ...... | 28 cm | ...... |
The circumferences of two circles are in the ratio 4 : 5. What is the ratio of their radii?
