Given the diameter d of the inner circle of the annulus. Given length z of a chord of the outer circle of the annulus. This chord is tangent to the inner circle of the annulus. Find the area y of the annulus.
Determine if a Given Number is a Triangle Number
Is the Point in a Circle?
Create a vector
Check availability of a number in an array
sum all digits
cos for boss?
give nth decimal place of pi
count any radix?
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