The inner circumference of a circular track is 176 m. The track is 7 m wide. Calculate the:
(a) area of the track.
(b) c

2 thoughts on “The inner circumference of a circular track is 176 m. The track is 7 m wide. Calculate the:<br />(a) area of the track.<br />(b) c”

1. Area of the track is 1386m^21386m

   2

   and Cost of putting up a fence along the outer circle at the rate of rs 12 per metre is Rs.2640

   Step-by-step explanation:

   Step-by-step explanation:

   Circumference of circle = 2 \pi r2π r

   Inner circumference = 176 m

   So, 2 \times \frac{22}{7} \times r = 1762×

   7

   22

   ×r=176

   r = 176 \times \frac{7}{22 \times 2}r=176×

   22×2

   7

   r = 28r=28

   Inner radius r = 28 m

   The track is 7 m wide .

   Outer radius R = 28+7 = 35 m

   Area of track = Outer area – Inner area = \pi R^2-\pi r^2=\frac{22}{7}(35^2-28^2)=1386m^2πR

   2

   −πr

   2

   =

   7

   22

   (35

   2

   −28

   2

   )=1386m

   2

   Outer circumference = 2 \pi R = 2 \times \frac{22}{7} \times 35=220 m2π R=2×

   7

   22

   ×35=220m

   Cost of fencing 1 m = Rs.12

   Cost of fencing 220 m = 12 \times 220 = Rs.264012×220=Rs.2640

   Hence Area of the track is 1386m^21386m

   2

   and Cost of putting up a fence along the outer circle at the rate of rs 12 per metre is Rs.2640

   Reply

2. Step-by-step explanation:

   i hope it is help full for you. if you like my answer than mark me as brilliant and like my answer.

   Reply