A rope lies tight around the equator. You make it 1 metre longer. How many centimetres does it now float above the ground everywhere?

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The answer

15.9 centimetres

About 16 cm. Whether around the Earth or a football.

How to get there

1. 1 m more circumference means 1 m ÷ (2 × pi) more radius
2. 100 cm ÷ 6.28 = 15.9 cm

Source: Calculation

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