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anonymous

  • one year ago

1.) The area of a regular octagon is 35 cm squared. What is the area of a regular octagon with sides three times as long? My answer: 315 cm squared. Is that correct? 2.) Name the minor arc and find its measure. http://assets.openstudy.com/updates/attachments/4fb5f543e4b05565342bcb5a-kamuela710-1337324879047-4568453162011122648pm17916 My answer: ADB has a measure of 245. Is that correct?

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  1. anonymous
    • one year ago
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    3.) The figures below are similar. What are a) the ratio of the perimeters and b) the ratio of the areas of the larger figure to the smaller figure? The figures are not drawn to scale. http://assets.openstudy.com/updates/attachments/55bcef17e4b0c4d93d6c2874-lollygirl217-1438476949164-as.jpg My answer: 13/3=169/9. Is that correct?

  2. anonymous
    • one year ago
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    @Michele_Laino @triciaal

  3. anonymous
    • one year ago
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    @pooja195 @ganeshie8

  4. anonymous
    • one year ago
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    @amistre64

  5. anonymous
    • one year ago
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    @nincompoop

  6. anonymous
    • one year ago
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    @undeadknight26

  7. amistre64
    • one year ago
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    how do we determine the area of a regular octagon to start with?

  8. amistre64
    • one year ago
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    im pretty sure the general solution is that a change in linear measures, scale by ^2 in area

  9. amistre64
    • one year ago
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    so 315 sounds good to me, but i always have to dbl chk with the brute method since i cant recall thrms that well

  10. anonymous
    • one year ago
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    Alright, do your thing.

  11. amistre64
    • one year ago
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    a triangle ... base s, apothem a, area = sa/2 and there is 8 of them area = 4 sa linear measures factor by 3 so: 4(3s)(3a) = 3^2 (4sa) in this case 3^2 (35) is good

  12. amistre64
    • one year ago
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    the link to the arc is bad

  13. anonymous
    • one year ago
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    Oh it is? Hold on.

  14. anonymous
    • one year ago
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  15. amistre64
    • one year ago
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    ok, and what does it mean to be a minor arc?

  16. anonymous
    • one year ago
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    @amistre64 well firsts things first. Did I get any of them right?

  17. anonymous
    • one year ago
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    I mean that one right.

  18. amistre64
    • one year ago
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    yes, i verified that 315 is correct. on the second one, and the third one, i would perfer to see how you came to your solutions first tho.

  19. amistre64
    • one year ago
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    to determine the solution to number 2, we need to agree on the definition of a minor arc.

  20. anonymous
    • one year ago
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    Perhaps it's just AB has a measure of 245.

  21. anonymous
    • one year ago
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    AB is minor because of the two arcs in the circle AB has a measure of 115 degrees and ADB has a measure of 245. This is what I say

  22. amistre64
    • one year ago
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    perhaps, but that depends on what our definition of a minor arc is ...

  23. amistre64
    • one year ago
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    AB is minor, agreed, since it is less then 180 .. and it is measured for us already as 115

  24. amistre64
    • one year ago
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    we good to move on to #3?

  25. anonymous
    • one year ago
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    So then it would be ab measured as 115?

  26. amistre64
    • one year ago
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    correct

  27. anonymous
    • one year ago
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    Lol...how did I make that mistake?

  28. amistre64
    • one year ago
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    :) pretty sure you read minor as "major" ... i read things too fast sometimes as well

  29. anonymous
    • one year ago
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    Yeah, I did.

  30. amistre64
    • one year ago
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    tell me how you approached #3

  31. anonymous
    • one year ago
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    a) ratio of perimeters = 26/6 = 13/3 b) ratio of areas = (13/3)² = 169/9 <----------A = L²

  32. amistre64
    • one year ago
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    i like it.

  33. amistre64
    • one year ago
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    not sure if the notation is correct, since im not taking your class specifically 13:3, or 1 : 13/3 is what i am used to playing with

  34. amistre64
    • one year ago
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    if the ratio of sides of similar shapes is: 1:k the ratio of their ares is: 1:k^2

  35. anonymous
    • one year ago
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    So it is 13/3, I got have of it right. Then it must be 13/3 and 16/9

  36. anonymous
    • one year ago
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    Or are you saying I got it right??

  37. amistre64
    • one year ago
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    you got it right; 13/3 and 13^2/3^2 is fine

  38. amistre64
    • one year ago
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    13^2 = 169 3^2 = 9 just make sure your notation is accurate to your course.

  39. amistre64
    • one year ago
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    going from large to small might mean: 3/13 and 9/169

  40. anonymous
    • one year ago
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    Alright thank you.

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