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Surface of the sphere

Stift.gif   Task

The biggest prize at the tombola of the annual summer festival of a bowling club is a gold plated bowling ball.
Its diameter is 21cm, the three holes have a diameter of 2cm.
What is the size of the gold-covered surface?
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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Information icon.svg Solution

O =   1380 cm²    (Select the red area to see the solution)