Question

What is the radius of a circle that has a circumference of 81.64 meters?

Answer 1

@PinkSapphire

Answer 2

This is the equation:
81.64=2(3.14)r

Answer 3

so 2 would be the answer ?

Answer 4

No, the radius is going to be 13.

Answer 5

Do you want me to show you how to do it?

Answer 6

how u get 13

Answer 7

yes plz

Answer 8

81.64=2(3.14)r Remember that r is the radius.

2*3.14 Multiply 2 by 3.14 (3.14 is pi).

81.64=6.28r So now you have this...

81.64/6.28=6.28/6.28r Now you divide 6.28 to get r by itself.

13=r or r=13

Answer 9

still don't get it lol

Answer 10

Um...did you learn this yet?

Answer 11

yes but i don't understand it

Answer 12

Try watching this video:
http://www.virtualnerd.com/pre-algebra/perimeter-area-volume/circles/circumference/circle-radius-from-circumference

Answer 13

What is the diameter of a circle that has a circumference of 56.52 feet?

56.52=2(3.14)r
3.14 times 2=6.28
56.52=6.28
----- ---
6.28 6.28
---- ----
9 1

Answer 14

correct?

Answer 15

so r=9

Answer 16

No, that would be the radius...but the diameter would be 18.

Answer 17

how would u find the diameter

Answer 18

Radius is half of the diameter.

Answer 19

how u get 18 do u have to divide 9 by 3.14?

Answer 20

No, you multiply the radius by 2.
9*2=18

Answer 21

What is the circumference of a circle that has a radius of 10 centimeters?
do u do the same thing for the circumference ?

Answer 22

so 10=2(3.14)r
10=6.28
10=6.28
--- -----
6.28 6.28
---- ----
1.59 1
---- -----
1.59
r=1.59
1.59times 2=3.18

Answer 23

To find the circumference, you have to multiply the diameter and 3.14.

Answer 24

the diameter is gonna be 10 right

Answer 25

so 10times 3.14 is 31.4

Answer 26

10 is the radius. 20 is the diameter. 20(3.14)=62.8

Answer 27

how is 20 the diameter

Answer 28

10 is half the distance of the circle. 20 is the full distance across the circle.