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Liv1234

  • one year ago

PLEASE PLEASE PLEASE PLEASE PLEASE HELP ME

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  1. Liv1234
    • one year ago
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  2. anonymous
    • one year ago
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    what do you need help with

  3. Liv1234
    • one year ago
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    The question I just posted

  4. anonymous
    • one year ago
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    i see now do you know how to find the area of a regular octagon

  5. alekos
    • one year ago
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    area = length x length so from here you can work out what the answer might be

  6. Liv1234
    • one year ago
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    I think it's either A or C.

  7. alekos
    • one year ago
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    your just guessing

  8. Liv1234
    • one year ago
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    No, wouldn't it be 210 because 35*6=210?

  9. anonymous
    • one year ago
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    ya you shouldnt guess

  10. Liv1234
    • one year ago
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    I'm not just guessing......

  11. alekos
    • one year ago
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    If you increase the length by 6 then the area will increase by 6 squared

  12. Liv1234
    • one year ago
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    So, it is A?

  13. Liv1234
    • one year ago
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    Because 35*6^2=1260

  14. alekos
    • one year ago
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    well done

  15. Liv1234
    • one year ago
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    Can you help me with another question?

  16. alekos
    • one year ago
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    yep

  17. Liv1234
    • one year ago
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  18. Liv1234
    • one year ago
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    Is there a specific formula I'm supposed to do to solve this one?

  19. Liv1234
    • one year ago
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    @alekos I got 25.12 for some reason, but that's not an option.

  20. alekos
    • one year ago
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    yes there is a specific formula Area of a circle is pi x r^2 but in this case we only have part of a circle or a fraction of a circle. What do you think that fraction will be?

  21. Liv1234
    • one year ago
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    the fraction would be 1/2 since we have half a circle.

  22. alekos
    • one year ago
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    No we don't. Half a circle would be 180 degrees. We have 172 degrees

  23. Liv1234
    • one year ago
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    Ohh, I'm sorry that's right. So 172.

  24. Liv1234
    • one year ago
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    So, how would I calculate it?

  25. alekos
    • one year ago
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    and the fraction is 172/?

  26. Liv1234
    • one year ago
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    172/1?

  27. Liv1234
    • one year ago
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    Or 172/4?

  28. alekos
    • one year ago
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    No. Whats the number of degrees of a full circle?

  29. Liv1234
    • one year ago
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    360

  30. alekos
    • one year ago
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    yes. so the fraction is ?

  31. Liv1234
    • one year ago
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    172/360

  32. alekos
    • one year ago
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    beautiful. so this is what you have to multiply by the area of the circle with radius 4

  33. Liv1234
    • one year ago
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    172/360*4

  34. alekos
    • one year ago
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    no. whats the area of a circle?

  35. Liv1234
    • one year ago
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    360?

  36. alekos
    • one year ago
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    no. thats the number of degrees. Have you been taught the area formula?

  37. Liv1234
    • one year ago
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    We're trying to figure out the area, right? So how would I know the area?

  38. alekos
    • one year ago
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    Yes we are. I'm asking you if you know the Area formula of a full circle with radius r

  39. Liv1234
    • one year ago
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    pi*r^2

  40. Liv1234
    • one year ago
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    The answer is 24.

  41. alekos
    • one year ago
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    OK. now we're getting somewhere So the area of the arc (172 deg) = (172/360)*pi*r^2

  42. alekos
    • one year ago
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    do you follow?

  43. Liv1234
    • one year ago
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    The answer is 24.

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