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Surface of the sphere
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.
Click inside the bright gray box. It turns turquoise. Enter your solution.
You may also use the menu, which is available via rightclick.
Complete your input with the RETURN-key. Green: right. Orange: wrong
See also: Using the Formel-Applet