Question

PIC BELOW PLEASE HELP
A running track is in the shape of the figure shown. What is the approximate length of one lap? Use three point one four for pi

Answer 1

A.357 FT
B.600 FT
C.714 FT
D.914 FT

Answer 2

lets break up the picture into 2 different parts of the track. we have the straight lines (each one is 200ft long) and we have the half circles. we see from the picture that the diameter of the half circle is 100. so the radius is 50. the equation for circumference of a circle is (pi) x (radius)^2. now remember that its only a half circle on each end

Answer 3

sorry typo.

Answer 4

the circumference is just the diameter X pi.

Answer 5

LOST

Answer 6

Alright, you see that dotted line?

Answer 7

YEA

Answer 8

That divides the figure to a semi circle. Now, the formula for the length of that semi circle is pi(r) where r is the radius.

Answer 9

That's a part of it.

Answer 10

I trust you can figure out r?

Answer 11

I mean, I can go ahead and serve you with a solution but I consider it important for you to understand what we just did here. Do I have you on this?

Answer 12

SO A?

Answer 13

c is the solution, if you're so keen on it. I was only going step by step.

Answer 14

MERTSJ DOUAGREE WITH C

Answer 15

Yes. :|

Answer 16

Made an error, there. 1028

Answer 17

Damn.

Answer 18

Wait a cotton pickin minute! 100 is 2r. Isn't it?

Answer 19

your mistake was adding the circumference twice

Answer 20

it should be 714

Answer 21

If we're takin half the circle that's 3.14*r. r=100

Answer 22

exactly

Answer 23

sorry, 2r=100

Answer 24

du! :)

Answer 25

@electrokid 2r=100 r=50! that is:-
(pi)r+200+(pi)r+200
that is 157+200+157+200
That is 714!

Answer 26

Damn, I'm easy to confuse!

Answer 27

yes.. I missed the "half" circle

Answer 28

good work guys