## anonymous one year ago A running track in the shape of an oval is shown. The ends of the track form semicircles

1. anonymous

What is the perimeter of the inside of the track? (π = 3.14)

2. anonymous

3. anonymous

Are you looking for perimeter or area?

4. anonymous

perimeter...im really bad at math :b

5. anonymous

I am too. I'm not sure how to answer this sorry

6. anonymous

Every perfectionist was once a beginner.. :)

7. anonymous

its ok :)

8. anonymous

Well good luck! :)

9. anonymous

That track is made up of Rectangle and two semicircles..

10. mathstudent55

|dw:1437508710133:dw|

11. anonymous

If the semicircle is having same radius then two semicircle = 1 cirle..

12. anonymous

ok

13. anonymous

But you need to find the perimeter of inside track, so go with mathstudent55..

14. anonymous

ok then thx

15. mathstudent55

The track is made up of 2 line segments each 130 m long. Then the track also is made up of 2 semicircles. Two semicircles combine to form one circle. P = 130 m + 130 m + circumference of circle. To find the circumference of the circle use the formula, $$C = \pi d$$ You are given d, the diameter as 56 m.

16. anonymous

you can notice that inner track diameter is 56m...

17. mathstudent55

$$P = 130 m + 130 m + \pi \times 56 m$$

18. anonymous

so now do i do pie times diameter?

19. anonymous

ok thank you so much! @mathstudent55 and u too :) @waterineyes

20. anonymous

21. mathstudent55

Yes. pi * diameter is the full circle's circumference. Then you add that to 130 + 130.

22. mathstudent55

Correct.

23. anonymous

ok thank you!

24. mathstudent55

You're welcome.