# The Radius of the Wheel of a Vehicle is 42 Cm. How Many Revolutions Will It Complete in a 19.8-km-long Journey? - Mathematics

Sum

The radius of the wheel of a vehicle is 42 cm. How many revolutions will it complete in a 19.8-km-long journey?

#### Solution

Radius of the wheel = 42 cm

Circumference of the wheel = 2πr

= 2 xx 22/7xx420

= 264 cm

=264/100  "m"

= 2.64 m

Distance covered by the wheel in 1 revolution = 2.64 m

Total distance = 19.8 km or 19800 m

∴ Number of revolutions taken by the wheel =19800/2.64 = 7500

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#### APPEARS IN

RS Aggarwal Secondary School Class 10 Maths
Chapter 18 Area of Circle, Sector and Segment
Exercise 18B | Q 30 | Page 832
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