“The surface of a sphere? Multiply circumference by diameter.”
“Right!” cried Rosette; “but it ought to be done by this time.”
“Circumference, 1,400; diameter, 450; area of surface, 630,000,” read the captain.
“True,” replied Rosette, “630,000 square miles; just 292 times less than that of the earth.”
“Pretty little comet! nice little comet!” muttered Ben Zoof.
The astronomer bit his lip, snorted, and cast at him a withering look, but did not take any further notice.
“Now, Captain Servadac,” said the professor, “take your pen again, and find me the volume of Gallia.”
The captain hesitated.
“Quick, quick!” cried the professor, impatiently; “surely you have not forgotten how to find the volume of a sphere!”
“A moment’s breathing time, please.”