Area, SM-Bank 033 MC

A piece of cardboard is shown in the diagram below.

The area of the cardboard, in square centimetres, is

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\(B\)

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\(\text{Area}\)	\(=\text{Large square}-4\times\text{Corner squares}\)
	\(=(5\times 5)-4\times (1\times 1)\)
	\(=21\ \text{cm}^2\)

\(\Rightarrow B\)