HELPP!! Giving brainlist to best answer

Answer:
About 756 ft.
Step-by-step explanation:
Well, I thought I'd solve it with my own smarts, then found out, I'm a little too dumb to figure it out, so, I went to my back up plan: Google. If you simply google: What is the base length of the Great Pyramid, it tells you, the length averages 755.75 feet, which rounded, is 756 feet. Hope it helps!