how long will a man take to make a round of a circular feild of radius 21 m,cycling at the speed of 8 Km/h
Answers
Answer:
The time taken by the man who cycling at the speed of 8km/h on circular field is 59.4 seconds .
Step-by-step explanation:
Formula
Circumference\ of\ a\ circle = 2\pi rCircumference of a circle=2πr
Where r is the radius of the circle .
Speed = \frac{Distance}{Time}Speed=
Time
Distance
As given
A man take to make a of a circular field of radius 21 m.cycling at the speed of 8km/h .
Put all the values in the formula
\pi =\frac{22}{7}π=
7
22
Circumference\ of\ a\ circle = 2\times \frac{22}{7}\times 21Circumference of a circle=2×
7
22
×21
Circumference\ of\ a\ circle = 2\times 22\times 3Circumference of a circle=2×22×3
Circumference\ of\ a\ circle = 132\ mCircumference of a circle=132 m
As 1 km = 1000 m
1\ m = \frac{1}{1000}\ km1 m=
1000
1
km
Now convert 132m into km .
132\ m = \frac{132}{1000}\ km132 m=
1000
132
km
= 0.132 km
I.e
Distance = 0.132 km
Speed = 8 km / h
Put all the values in the formula
8 = \frac{0.132}{Time}8=
Time
0.132
Time= \frac{0.132}{8}Time=
8
0.132
Time = 0.0165 hr
As
1 hour = 3600 second
Now convert 0.0165 hr into seconds .
0.0165 hour = 0.0165 × 3600
= 59.4 seconds
Therefore the time taken by the man who cycling at the speed of 8km/h on circular field is 59.4 seconds .