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### 인기 인용구

9 페이지 - Magnitudes which have the same ratio to the same magnitude, are equal to one another: and those to which the same magnitude has the same ratio, are, equal to one another.
8 페이지 - Equal magnitudes have the same ratio to the same magnitude : and the same has the same ratio to equal magnitudes.
7 페이지 - PROPORTION when the ratio of the first to the second is equal to the ratio of the second to the third.
36 페이지 - In any proportion, the product of the means is equal to the product of the extremes.
7 페이지 - This proposition, which is to the effect that " Ratios which are equal to the same ratio are equal to one another...
9 페이지 - Of unequal magnitudes the greater has a greater ratio to the same than the less has : and the same magnitude has a greater ratio to the less than it has to the greater.
3 페이지 - A LESS magnitude is said to be a part of a greater magnitude, when the less measures the greater; that is, when the less is contained a certain number of times exactly in the greater.
7 페이지 - Four quantities are in proportion when the ratio of the first to the second is equal to the ratio of the third to the fourth.
4 페이지 - The ratio of one magnitude to another of the same kind is the quotient obtained by dividing the numerical measure of the first by that of the second, the unit being the same in each case.
15 페이지 - Conversely, if a straight line divides two sides of a triangle proportionally, it is parallel to the third side. Let DE divide the sides AB, AC, of the triangle ABC, proportionally; then DE is parallel to BC. For, if DE is not parallel to BC, let some other line DE', drawn through D, be parallel to BC. Then, by Proposition L, AB: But, by hypothesis, we have AB: AD = AC: AE. Hence AC AE' AC AE