anonymous
  • anonymous
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
Mathematics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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butterflydreamer
  • butterflydreamer
Hint: Diameter = 2 * radius
butterflydreamer
  • butterflydreamer
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anonymous
  • anonymous
uhh im still lost for example like diameter is 7 wht is the circumference of a circle wht do i put

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butterflydreamer
  • butterflydreamer
ahhhh okay! So do you know what the formula is to find the circumference of a circle? :)
anonymous
  • anonymous
kinda
butterflydreamer
  • butterflydreamer
\[circumference= 2 \pi r\] 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
anonymous
  • anonymous
like tht for example Suppose the circumference of a circle is 16π. What is its radius?
anonymous
  • anonymous
this i mean this
butterflydreamer
  • butterflydreamer
\[Circumference = 2 \pi r \] 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)
anonymous
  • anonymous
soooo 6pi
anonymous
  • anonymous
o no i mean 8pi
butterflydreamer
  • butterflydreamer
close but not quite! \[2 \pi r = 16 \pi\] Divide both sides by 2 pi \[\frac{ 2 \pi r }{ 2 \pi} = \frac{ 16 \pi }{ 2 \pi}\] \[r = 8 \]
anonymous
  • anonymous
o ok soo i got anotherone Suppose the circumference of a circle is 3π. What is its diameter?
butterflydreamer
  • butterflydreamer
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.
anonymous
  • anonymous
3?
butterflydreamer
  • butterflydreamer
excellent!! :D
anonymous
  • anonymous
awesome thx and another one a diameter is 12 what is the radius
butterflydreamer
  • butterflydreamer
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

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