book Maths Puzzle Numerical Ability

explain why for a right angle triangle with legs a,b and hypothenusec, we get the result C2=A2+B2

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book Other Question

simlify the fraction -(2x//xy) completely. would this be -2/y? The problem is dealing with a regular hexagon(17), and I believe a regular triangle inscribed in a circle(18). You are givin the diameter(#17 is 12 and #18 is 16) You are asked to