How many man hours did it take to build the great pyramid of Giza? Historians believe that the pyramid took about 20 years to build. With this number we can use a little math and physics to estimate the minimum number of people involved in the construction.
###### Image credit: Wikipedia Janusz Reclaw

The first piece of information we need to know is how much volume the great pyramid has. When it was built, the pyramid had a height of about 150 m and the length of the square base was 230 m. What then is the total volume of the pyramid in m\(^3\)?

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