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Since the question does not specify what the ancient telephone with, I shall compare it to a fish. The 5 differences between an ancient telephone and a fish are: The ancient telephone was a man-made device, the fish is not. The ancient telephone was used for communication, the fish is not. The ancient telephone can survive longer outside of water, a fish cannot. The ancient telephone was not alive, a fish is. The ancient telephone had a mouthpiece, a fish has a mouth.
Yes. in fact, the Ancient Greeks invented pi.
I believe that the ancient Greeks used them for mathematics!
A great example of how ancient Egyptians used geometry is in the building of pyramids.
The ancient Babylonians used geometry to map agricultural land.