book Maths Puzzle Numerical Ability

How do u get the area of a cylinder.PLEASE

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book Other Question

Determine the GCF of the following terms:
54x^5 y^7 z^3 , 72x^3 y^5 z^2 , 63x^4 y^3 z^9 I get confused on the distributive rule when problems contain several variables such as the following. a/a + 2bcubed/b cubed - 4ksquaredx /2ksquared x + bcubed/b cubed
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