Question

so i got a question when it ask for the diameter of a circle and it gives me the radius do i put for example 7pi or just 7 and im confused with the whole circle/diamerter thing can someone explain please

Answer 1

Hint:
Diameter = 2 * radius

Answer 2

uhh im still lost for example like diameter is 7 wht is the circumference of a circle wht do i put

Answer 3

ahhhh okay!
So do you know what the formula is to find the circumference of a circle? :)

Answer 4

kinda

Answer 5

\[circumference= 2 \pi r\]
Where r = radius.
Remember how i said diameter = 2 * radius?
this means that
d= 2r
Therefore you want to find the value of "r" first :)
r = 1/2 * d

Answer 6

like tht for example Suppose the circumference of a circle is 16π. What is its radius?

Answer 7

this i mean this

Answer 8

\[Circumference = 2 \pi r \]
They've told us that the circumference of the circle equals to 16 pi and we want to find the radius right?
\[Circumference = 16 \pi \]
So this means that
\[2 \pi r = 16 \pi\]
Now just solve for "r" (radius)

Answer 9

soooo 6pi

Answer 10

o no i mean 8pi

Answer 11

close but not quite!
\[2 \pi r = 16 \pi\]
Divide both sides by 2 pi
\[\frac{ 2 \pi r }{ 2 \pi} = \frac{ 16 \pi }{ 2 \pi}\]

\[r = 8 \]

Answer 12

o ok soo i got anotherone Suppose the circumference of a circle is 3π. What is its diameter?

Answer 13

follow the same pattern.
Circumference of a circle formula:
\[Circumference = 2 \pi r\]
We are given the following information:
\[circumference = 3 \pi\]
\[\therefore 2 \pi r = 3 \pi\]
Divide both sides by 2 pi to find "r".
After you find "r", remember that d = 2r.
Since we want to find diameter, multiply r by 2.

Answer 14

3?

Answer 15

excellent!! :D

Answer 16

awesome thx and another one a diameter is 12 what is the radius

Answer 17

no worries :)
remember this:
DIAMETER = 2 TIMES RADIUS.
RADIUS = 1/2 DIAMETER

So if d = 2r
And we're told d = 12
12 = 2r
Solve for r