The length and breadth of a page of my e...

The length and breadth of a page of my exercise book is 15 cm. and 12 cm. respectivley. A margin of width 2 cm. is drawn on all sides and wrote inside the margin. Let's also draw a rough sketch for the problem. Let's find the area of the portion on which I wrote. Let's also find the area of the portion on which I have not written.

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