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RD Sharma Solutions Class 7 Mathematics Solutions for Mensuration 2 Exercise 21.1 in Chapter 21 - Mensuration 2 Area of Circle

Question 15 Mensuration 2 Exercise 21.1

A bicycle wheel makes 5000 revolutions in moving 11 km. Find the diameter of the wheel.

Answer:

Given total distance covered by bicycle in 5000 revolutions = 11 km = 11000 m

Therefore distance covered in 1 revolution = 11000/5000 = 2.2 m = 11/5

Distance covered in 1 revolution = Circumference of the wheel

C = π d

11/5 = (22/7) d

d = (11 × 7)/ (5 × 22)

d = 77/110

d = 0.7 m

Therefore diameter of wheel = 0.7 m = 70 cm

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