It would be good to add a test where the solution is not 5*a, which always happens when b = 2*a.
e.g. a=2, b=9, r=17; a=1, b=8, r=13; a=18, b=25, r=73; etc.
good one :)
The circle is inscribed in a square. And the rectangle touching the square corner intersects the circle at one vertex precisely. (This needs to be said: we can't trust our eyes.)
The Goldbach Conjecture, Part 2
Distance walked 2D
Numbers with prime factors 2, 3 and 5.
letter yes yes & letter no no
03 - Matrix Variables 1
Number of divisors of a given number
length of string on cylinder
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