There are a few geometric terms that start with the letter G including great circle, glide, and golden ratio. Another example is golden mean.
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Trigonometry, triangle, times, ten, thousand . . . .
Multiply 10 by any number except zero, then divide 10 by the same number. The geometric mean of those two numbers will be 10.
scale factor
Points, lines and planes are precisely defined terms. These concepts have to be clearly delineated to form fundamental planks in geometry, and that's because as they do. In suggesting that they are undefined, we'd have to suspect everything that was built on them. No geometric figure could be discussed with any certainty unless the elements that make it up are clearly defined and understood.
A geometric sequence is an ordered set of numbers such that (after the first number) the ratio between any number and its predecessor is a constant.