Question

6.
A race-track is in the form of a ring whose outer circumference is 660 m and inner circumference is 616 m.
Find the width of the race-track. Take a =​

Answer 1

Answer:

since area of outer circle is 660cm^2

2πr=660

r=660×7÷44

r=105 cm

Area of inner circle is 616 cm^2

2πr=616

r=616×7÷44

r=98 cm

Hence,

width of race track is

=105-98

=7 cm

So, width of race track is 7 cm