Which circles have a circumference of units? Choose all answers that are correct. A. a circle with a diameter of 40 units B. a circle with a radius of 10 units C. a circle with a diameter of 20 units D. a circle with a radius of 20 units Im think A C and D but i really don't know this one

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Which circles have a circumference of units? Choose all answers that are correct. A. a circle with a diameter of 40 units B. a circle with a radius of 10 units C. a circle with a diameter of 20 units D. a circle with a radius of 20 units Im think A C and D but i really don't know this one

Mathematics
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im looking at pics of a circumference and now i think its B

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Other answers:

"Which circles have a circumference of units" how much units?
well idk because there is no picture for me to see
there is no picture...
Your question is missing something.
Gabby you'll need to be more specifi with the question. @geerky42 could you help me please?
Which circles have a circumference of __?__ units
well thats all it says ill take a screenshot
1 Attachment
Gabby you missed the Pi there, that's very important =)
oh
ooooooooh
So circumference = 2*radius * pi. And diameter = 2 * radius. So circumference also = diameter * pi Can you solve it now?
so 4pi
?
So let's look at (a). If d = 40. What is d * pi? Does that equal 20 * pi?
no
Very good. Can you do the same for (b) now?
b is not correct either so now its just C and D
I think D
because it needs a radius
b is correct. let's go through it carefully. Remember, diameter is radius * 2. So you must multiply that 10 by 2.
oooooh i see what you're going at
diameter can be converted to radius (d = 2*r). Also, radius can be converted to diameter (r = d/2)
Okay, I get it now. Thank you! √
No problem! Good luck =)
It was B and C. Thanks for your help though. :)
yep, that's right.

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