book Maths Puzzle Numerical Ability

What size square can be inscribed in a circle of radius 8 inches. I am assuming to use pythagoran theorem which I know 8^2 will probably be the c^2 but I'm not sure how to figure o

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book Other Question

A boat that can travel 8 miles per hour in still water can travel 15 miles w with the water's current in the same time that it can travel 9 miles against the water's current. What solve x(x-1) = 3x + 2

I got x^2 - x = 3x + 2
x^2 - 4x - 2 = 0

im stuck!