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.)
Find common elements in matrix rows
Angle between two vectors
Count up then down
Find the maximum two numbers of every column of a matrix
Max of a Vector
Slicing the cube
length of string on cylinder
Number of divisors of a given number
Speed of light:Experiment
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