Which ancient Greek theatre was built on the flat surface? (not on the slope)
there was no such theatre
All Greek theatres were built on the slopes of a hill. It was not until Romans invented concrete, when the construction of tall theatres on flat surfaces (such as the Colosseum) became possible.
reach: rather globalancient architectureancient Greececontructionhistoryhistory of architecture
Illustration: Tilemahos Efthimiadis