Sometimes it is necessary to determine how large an inner circle has to be in order to have an area that is a certain percent of an outer circle.
Situations where this can occur:
(1) antibiotic disc susceptibility
(2) percent of hepatic lobule showing confluent perivenular necrosis
Parameters:
(1) radius of outer circle
(2) percent of outer circle area serving as target (expressed as a decimal fraction)
radius of inner circle with y percent of outer circle =
= (radius of outer circle) * SQRT((percent as a whole number)/100)
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Percent of Outer Circle Area
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Radius of Inner Circle as Percent of Outer Circle's Radius
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25%
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50%
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|
33%
|
57%
|
|
50%
|
70%
|
|
66%
|
81%
|
|
75%
|
87%
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