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Mathematics 15 Online
OpenStudy (geometry_hater):

NEED HELP REALLY BAD Find that probability that a point chosen at random in the figure lies in the Green circle. The Green Circle has a diameter of 24. (The Green Circle is in the Blue Square)

OpenStudy (geometry_hater):

OpenStudy (jamesj):

What's the area of the square, call it S? And what's the area of the circle, call it C? Then the probability of being in the green is \[ \frac{C}{S} \]

OpenStudy (geometry_hater):

it would be 24 right

OpenStudy (geometry_hater):

Area of circle is 2 PI r and 12 is radius

OpenStudy (geometry_hater):

its 75

OpenStudy (jamesj):

Area of the circle is \( C = \pi r^2 \)

OpenStudy (jamesj):

The area of the square is the length of the side, call it L, squared. What is the length of the side? What is L?

OpenStudy (geometry_hater):

24

OpenStudy (jamesj):

Hence \( S = L^2 = 24^2 = ... \). Now what is \( r \) and hence what is the area of the circle, \( C \)?

OpenStudy (geometry_hater):

452.38934211693022633862064719225

OpenStudy (geometry_hater):

or simply round down to 452

OpenStudy (jamesj):

Right, hence C/S = 452/576 = ...

OpenStudy (geometry_hater):

0.78472222222222222222222222222222

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