Question

The radius of a wheel is 21cm . In how many rotations will it cover a distance of 1320 cm ?​

Answer 1

Answer:

10 Rotations

Step-by-step explanation:

GIVEN

Radius = 7cm

Distance covered = 1320cm

SOLUTION

Step 1

Find the circumference of circle

Circumference of circle = 2πr

=

$2 \times \frac{22}{7} \times 21 = 132cm$

Step 2

Divide circumference by distance covered

$no. \: of \: rotations \\ = \frac{distance \: covered \: }{circumference \: of \: circle} \\ = \frac{1320cm}{132cm} = 10 \: rotations$