Скачать или смотреть Definitions and undefined terms | Geometry (TX TEKS) | Khan Academy

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Much of geometry depends on building our ideas from foundational pieces. We use definitions to be very clear about what we mean by a right angle, similar figures, or a line segment. If we go to the very base of even those definitions, we have to agree on some ideas, like what we mean by a point or a line, without being able to simply and clearly define them.

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