exam Maths Puzzle Numerical Ability

what is the difference in commutative property and associatative property?

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exam Other Question

How do I learn to identify if certain figures are polygons or not?? 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.