Plural of diameter: straight lines passing through the center of a circle or sphere, connecting two points on the edge and being twice the length of the radius.
From Latin 'diametros' from Greek 'dia-' (through) + 'metron' (measure). The word literally means 'measured across' and has been used in geometry since ancient times.
The diameter is one of the oldest mathematical concepts—the ancient Egyptians used it to build the pyramids, and knowing the diameter of a wheel was crucial for calculating how far a chariot would travel. It's mathematics that literally moves civilization forward.
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