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anonymous

  • one year ago

the diameter of circle symbol z is 5 in. what is the area in terms of pi ?

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  1. anonymous
    • one year ago
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  2. Nnesha
    • one year ago
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    what's the formula to find AREA of a circle ??

  3. anonymous
    • one year ago
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    a=pi radius squared

  4. Nnesha
    • one year ago
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    yes right and diameter is half of radius you can use this formula to find radius \[\huge\rm r=\frac{ d }{ 2 }\]

  5. anonymous
    • one year ago
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    so 2.5 in squared ?

  6. Nnesha
    • one year ago
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    yes right take square of 2.5

  7. anonymous
    • one year ago
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    huh?

  8. Nnesha
    • one year ago
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    well radius is 2.5 right ?

  9. anonymous
    • one year ago
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    yes it is

  10. Nnesha
    • one year ago
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    \[\huge\rm A =\pi r^2\]

  11. Nnesha
    • one year ago
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    substitute r for 2.5 ^^

  12. anonymous
    • one year ago
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    ok i get 6.25

  13. Nnesha
    • one year ago
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    right

  14. Nnesha
    • one year ago
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    and we have to write it interms of pi

  15. anonymous
    • one year ago
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    ok so 6.25pi in squared

  16. anonymous
    • one year ago
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    can you help me with another one @Nnesha

  17. Nnesha
    • one year ago
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    i willlll try not sure:=)

  18. anonymous
    • one year ago
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    can you help @DanJS

  19. DanJS
    • one year ago
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    ok

  20. anonymous
    • one year ago
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  21. anonymous
    • one year ago
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    this is the question

  22. DanJS
    • one year ago
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    the point C(x,y) is 3/4 the way from A to B along a line... youc an set up 2 equations involving x and y and solve or...

  23. DanJS
    • one year ago
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    since it is a line with a constant slope , the x and y components of that form a right triangle realizing that the relation between the lengths of each side by the pythagorean theorem c^2 = a^2 + b^2 if you shrink the hypotenuse down by 3/4 you have to do that to the other terms too

  24. DanJS
    • one year ago
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    (3/4)c^2 = (3/4)*a^2 + (3/4)*b^2

  25. anonymous
    • one year ago
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    ok

  26. DanJS
    • one year ago
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    so you can just look and see the change in x coordinate, and find 3/4 that, and add that to the start value

  27. DanJS
    • one year ago
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    Same for y coordinate

  28. anonymous
    • one year ago
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    ok so how do i this then ?

  29. DanJS
    • one year ago
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    The length in the x direction from A to B is 16, 3/4 of that is 12 start at A and move 12 in the X direction, that is the x coordinate of C

  30. DanJS
    • one year ago
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    do the same for the Y direction

  31. anonymous
    • one year ago
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    so 2,0

  32. anonymous
    • one year ago
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    thats what i got

  33. DanJS
    • one year ago
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    yeah, sounds good

  34. DanJS
    • one year ago
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    It is just basically shrinking a right triangle by 25% then seeing where it lies on the coordinates

  35. anonymous
    • one year ago
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    so i got that right ?

  36. DanJS
    • one year ago
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    or you can do it by setting up 2 equations involving x and y in the point N, then solving for the x and y

  37. DanJS
    • one year ago
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    Distance AC = 3/4 * Distance AB and equation of the line through AB

  38. anonymous
    • one year ago
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    ok cool but am i right ?

  39. DanJS
    • one year ago
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    yes, you can check by just calculating the distances AB and AC and check if they are correct

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