exam Maths Puzzle Numerical Ability

I have a 48" square piece of plywood. I want to cut it into an octogon with all 8 sides equal length. How do I calculate this?

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exam Other Question
use g(x)=5/(1-2x) and f(x)=1-x^2


find f(-5)


find the domain of g(x) Make up a problem whose solution is (4,1) with 2 equations.