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Dyfyniad Arddull ChicagoPerry, Earl. Geometry: Axiomatic Developments with Problem Solving. New York: M. Dekker, 1992.
Dyfyniad MLAPerry, Earl. Geometry: Axiomatic Developments with Problem Solving. M. Dekker, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.