Question

A wheel makes 5000 revolutions for covering 11km.
Find its circumference,diameter and
Area.

Answer 1

A wheel makes 5000 revolutions for covering 11km
11km = 11000m

In 1 revolution, it will cover = 11000m/5000 = 11/5 m = 2.2m
So its circumference is 2.2m

circumference = πD
⇒ πD = 2.2
⇒ 22/7 × D = 2.2
⇒ D = 2.2 × 7/22 = 0.7m

radius = 0.7/2 = 0.35m
area = πr² = 22/7 × 0.35 × 0.35 = 0.385 m²

Answer 2

Solution:-
given ,
wheel's revolutions = 5000 for 11km = 11000m

= 1 revoution = 11000/5000= 2.2m

=(circumfrence = 2.2m)ans

=2×pi×r = 2.2 ( diameter = 2r)

diameter
= 2.2×7/22

= ( diameter = 7/10 = 0.7m)ans

= area = pi×(r)^2

= area = 22/7(0.7/2)^2

= (area = 0.385m^2) ans