exam Maths Puzzle Numerical Ability

please i need help with this problem: the shortest distance from the centre of a circle to a chord is 5 cm. find the radius (2d.p.) of the circle if the chord is 3*2 times longer than the radius.

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exam Other Question

what is the difference in commutative property and associatative property? The attached link contains a graph of the polynomial function y = f(x). For which of the values k = 0, 1, 2 or 3 will the equation f(x) = k have complex roots?
http://s227.photobu