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anonymous

  • one year ago

i'll medal please help

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    please help

  3. anonymous
    • one year ago
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    can someone explain how to do it and not just give me the answer please

  4. anonymous
    • one year ago
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    @mathstudent55

  5. anonymous
    • one year ago
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    circumference of a semicircle: (1/2) x pi x d where d is the diameter

  6. anonymous
    • one year ago
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    so what is the diameter of the semicircle?

  7. ybarrap
    • one year ago
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    What is r here? That's that's the hardest part of the problem. |dw:1434406738797:dw|

  8. ybarrap
    • one year ago
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    What is the relationship between r and 3 ?

  9. ybarrap
    • one year ago
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    |dw:1434406911440:dw|

  10. ybarrap
    • one year ago
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    So the answer is \(\pi\times r\). So all you need to find is r. Any guesses?

  11. anonymous
    • one year ago
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    oh sorry i was eating let me look

  12. anonymous
    • one year ago
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    @ybarrap well 2 x pi is 6.28

  13. anonymous
    • one year ago
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    i still dont know how to find r im sorry im bad at this

  14. ybarrap
    • one year ago
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    |dw:1434407560400:dw|

  15. ybarrap
    • one year ago
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    Do you see that what r is now?

  16. anonymous
    • one year ago
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    ohhh

  17. anonymous
    • one year ago
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    yes!

  18. anonymous
    • one year ago
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    so is the answer 18.84?

  19. ybarrap
    • one year ago
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    What is r?

  20. anonymous
    • one year ago
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    3 i think

  21. anonymous
    • one year ago
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    or 1.5

  22. ybarrap
    • one year ago
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    Yes! So the answer is ....

  23. anonymous
    • one year ago
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    9.42 ft

  24. ybarrap
    • one year ago
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    \(\pi\times r\), which is half the circumference of a circle with a radius of r

  25. ybarrap
    • one year ago
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    you know \(\pi\) and you know r - just multiply

  26. anonymous
    • one year ago
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    ohhh it's 4.71?

  27. ybarrap
    • one year ago
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    Yes!

  28. anonymous
    • one year ago
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    okay, thank you so much for your help! :-)

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