gabbyalicorn
  • gabbyalicorn
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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SOLVED
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katieb
  • katieb
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gabbyalicorn
  • gabbyalicorn
@geerky42
gabbyalicorn
  • gabbyalicorn
@zepdrix
gabbyalicorn
  • gabbyalicorn
im looking at pics of a circumference and now i think its B

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More answers

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

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