anonymous
  • anonymous
the diameter of circle symbol z is 5 in. what is the area in terms of pi ?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
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Nnesha
  • Nnesha
what's the formula to find AREA of a circle ??
anonymous
  • anonymous
a=pi radius squared

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Nnesha
  • Nnesha
yes right and diameter is half of radius you can use this formula to find radius \[\huge\rm r=\frac{ d }{ 2 }\]
anonymous
  • anonymous
so 2.5 in squared ?
Nnesha
  • Nnesha
yes right take square of 2.5
anonymous
  • anonymous
huh?
Nnesha
  • Nnesha
well radius is 2.5 right ?
anonymous
  • anonymous
yes it is
Nnesha
  • Nnesha
\[\huge\rm A =\pi r^2\]
Nnesha
  • Nnesha
substitute r for 2.5 ^^
anonymous
  • anonymous
ok i get 6.25
Nnesha
  • Nnesha
right
Nnesha
  • Nnesha
and we have to write it interms of pi
anonymous
  • anonymous
ok so 6.25pi in squared
anonymous
  • anonymous
can you help me with another one @Nnesha
Nnesha
  • Nnesha
i willlll try not sure:=)
anonymous
  • anonymous
can you help @DanJS
DanJS
  • DanJS
ok
anonymous
  • anonymous
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anonymous
  • anonymous
this is the question
DanJS
  • DanJS
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...
DanJS
  • DanJS
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
DanJS
  • DanJS
(3/4)c^2 = (3/4)*a^2 + (3/4)*b^2
anonymous
  • anonymous
ok
DanJS
  • DanJS
so you can just look and see the change in x coordinate, and find 3/4 that, and add that to the start value
DanJS
  • DanJS
Same for y coordinate
anonymous
  • anonymous
ok so how do i this then ?
DanJS
  • DanJS
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
DanJS
  • DanJS
do the same for the Y direction
anonymous
  • anonymous
so 2,0
anonymous
  • anonymous
thats what i got
DanJS
  • DanJS
yeah, sounds good
DanJS
  • DanJS
It is just basically shrinking a right triangle by 25% then seeing where it lies on the coordinates
anonymous
  • anonymous
so i got that right ?
DanJS
  • DanJS
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
DanJS
  • DanJS
Distance AC = 3/4 * Distance AB and equation of the line through AB
anonymous
  • anonymous
ok cool but am i right ?
DanJS
  • DanJS
yes, you can check by just calculating the distances AB and AC and check if they are correct

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