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Version vom 15. März 2013, 20:11 Uhr

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Vorlage:Kurzinfo-2

Surface of the sphere

Stift.gif   Task

The biggest prize at the tombola of the annual summer festivl of a bowling club is a gold plated bowling ball.
Its diameter is 21cm, the three holes have a diameter of 2cm.
How big is the gold-covered surface of the ball?
The holes have not been covered with gold; to simplify, a circular shape of the holes is assumed and the gold layer's thickness may be disregarded.
Round to three significant digits.

bitte warten


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