Question

The ‘Great Pyramid of Giza’ has a square base of side length 230.4 m and a height
of 138.8 m. What is its approximate volume?

Answer 1

Volume of a pyramid = $\frac{1}{3}$ Area of base * Height. 
So, the area of base in your question will be 53084.16 m^2 and height is 138.8 m
The are will be 53084.16 m^2.
The volume comes out to be 2456027.136 m^3.