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anonymous

  • one year ago

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

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  1. butterflydreamer
    • one year ago
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    Hint: Diameter = 2 * radius

  2. butterflydreamer
    • one year ago
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    |dw:1441285319505:dw|

  3. anonymous
    • one year ago
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    uhh im still lost for example like diameter is 7 wht is the circumference of a circle wht do i put

  4. butterflydreamer
    • one year ago
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    ahhhh okay! So do you know what the formula is to find the circumference of a circle? :)

  5. anonymous
    • one year ago
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    kinda

  6. butterflydreamer
    • one year ago
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    \[circumference= 2 \pi r\] 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

  7. anonymous
    • one year ago
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    like tht for example Suppose the circumference of a circle is 16π. What is its radius?

  8. anonymous
    • one year ago
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    this i mean this

  9. butterflydreamer
    • one year ago
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    \[Circumference = 2 \pi r \] 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)

  10. anonymous
    • one year ago
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    soooo 6pi

  11. anonymous
    • one year ago
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    o no i mean 8pi

  12. butterflydreamer
    • one year ago
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    close but not quite! \[2 \pi r = 16 \pi\] Divide both sides by 2 pi \[\frac{ 2 \pi r }{ 2 \pi} = \frac{ 16 \pi }{ 2 \pi}\] \[r = 8 \]

  13. anonymous
    • one year ago
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    o ok soo i got anotherone Suppose the circumference of a circle is 3π. What is its diameter?

  14. butterflydreamer
    • one year ago
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    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.

  15. anonymous
    • one year ago
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    3?

  16. butterflydreamer
    • one year ago
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    excellent!! :D

  17. anonymous
    • one year ago
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    awesome thx and another one a diameter is 12 what is the radius

  18. butterflydreamer
    • one year ago
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    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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