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The height of a column with a diameter of 40 cm is 100 cm. I want to know the area and length of this rectangle.
When a cylinder expands, it becomes a rectangle.

So the length = π d = 3.14x40 =125.6cm.

So s =125.6x100 =12560 square centimeters.

The rectangle has an area of 12560 and a length of 125.6 cm.

I hope it helps you.

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