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.
Energy of a photon
Find out sum of all elements of given Matrix
Pernicious Anniversary Problem
Times 3 problem
chance in percent for minimum K heads when a good coin is tossed N times?
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