Question

The diameter of a circle wheel is 21 cm how many Revolution will it make to travel 1.98 km

Answer 1

Given= radius 21/2
To find= revolutions it will take
Solution= Distance covered in 1 revolution= circumference of the tire
= 2πR
= 2(22/7)(21/2)
=66 cm
Total distance it has to travel=1.98 Km
=198000 cm
total revolution =total distance/distance
covered in 1
revolution
=198000/66
=3000
Hence it will make 3000 revolutions

THANKS !

Answer 2

Answer:

D=21

$\red{circumfrance \: of \: circle \: = \pi \: rd}$

$\green {c = \frac{22}{7} \times 21}$

$\red {c = 66}$

$\\ convert \:k m \: into \: cm = \\ 1.98 \times 100000 \\ \\ \pink{total \: no. \: of \: revoution = }$

$\blue{\frac{1.98 \times 100000}{66} }$

$\orange {3 \times 1000 = 3000}$

$\huge \star{ans = 3000 } \star$