Correction for the size of Alcatraz
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How big is 79,000,000 circular inches?
It's about half as big as Alcatraz
The size of Alcatraz is about 180,000,000 circular inches.
(a.k.a. The Rock) (California)
Alcatraz Island measures 180,000,000 circular inches. It is known a part of the Golden Gate National Recreation Area, and has historically served as a lighthouse, fort, military prison, and — most famously — a federal prison.