Question

WILL GIVE MEDAL IF YOU HELP!!!!!

Answer 1

If the diameter of the circle above is 18 in, what is the circumference of the circle?
A.18 in
B.81 in
C.9 in
D.36 in

Answer 2

\[c=2\pi~r^2\]

Answer 3

your diameter is \[18\] we need the radius so we will divide by 2 whats 18/2?

Answer 4

There is suppose to be a pi sign behind every number

Answer 5

yeah i gave you the formula :)
whats 18/2

Answer 6

So its A

Answer 7

no we need to solve this still

Answer 8

Is it A?

Answer 9

18/2 is 9 then plug it in the equation what do you get?

Answer 10

I dont know I just started learning these and its hard

Answer 11

Half of a diameter = radius

Answer 12

got that so far?

Answer 13

ya

Answer 14

\[C=2\pi~r^2\] that is the formula we use when finding the circumference understand?

Answer 15

Ya

Answer 16

ok so we said half of a diameter=radius
so we have a diameter which is 18 so to find the radius we divide by 2
\[18\div2\]

Answer 17

which equals 9 right

Answer 18

So its C

Answer 19

C is right :)