Question

A running track is in the shape of the figure shown. What is the approximate length of one lap? Use 3.14 for pi

Answer 1

so you have two straight lines of length 400, so that makes 800 right?

Answer 2

yes

Answer 3

The problem is those curved ends... they are shaped like half a circle, each, but there are two halves, so you can consider them as just one circle, aye?

Answer 4

yes

Answer 5

So, you have to find the circumference of that circle.
It has a radius of 200 meters, so its circumference is just 200 times pi.

Answer 6

714
1200
1428
1828

Answer 7

Sorry, a DIAMETER of 200 meters, not radius...

Answer 8

ok

Answer 9

so what is the length for one lap

Answer 10

So, what's the circumference of the circle?

Answer 11

i think it would be 1200 feet is that right?

Answer 12

I don't know, why don't we find out?

Answer 13

ok

Answer 14

So, the length of one lap

Answer 15

It's 800 plus the circumference of the circle with diameter 200

Answer 16

so 800 +200 + 200 =1200

Answer 17

Well, why did you add 200 + 200?

Answer 18

yes 400

Answer 19

What's the circumference of the circle with diameter 200?

Answer 20

idk

Answer 21

Formula for the circumference of a circle, if you have the diameter, is to simply multiply the diameter by pi.

Answer 22

ok so 200 * 3.14 = 628

Answer 23

That's good... now add THAT to 800

Answer 24

so it wouldbe 800 + 628 = 1428

Answer 25

Precisely :)

Answer 26

Ok if a perimeter of a square is 144 miles what is its area

Answer 27

12 square miles

48 square miles

144 square miles

1296 square miles

Answer 28

There really is no point posting the choices, you know :P

Answer 29

yeah

Answer 30

Now, if the perimeter of the square is 144, what's the length of one side?

Answer 31

you would have to divide right

Answer 32

Yup. With what, though?

Answer 33

with 48