New Plane Geometry

Cover New Plane Geometry
New Plane Geometry
Webster Wells
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Theorem 218. (Converse of Prop. I.) If the product of two numbers is equal to the product of two others, one pair may be made the extremes, and the other pair the means, of a proportion.
Given ad=:bc. (1) To Prove - = ^.
b d Proof. Dividing both members of (1) by bd, (id__bc 2i — l bd^bd'^^ b'^d' In like manner, we may prove - = - ; - = - ; etc.
c d a c Prop. III. Theorem 219. In any proportion, the terms are in proportion by Alter- nation; that is, the first term is to the third as the second
...term is to the fourth.
Given the proportion - = -. (1) a PROPORTION 103 To Prove 5 = ^.
c d Proof. From (1), ad = be. (§ 216) Then, 2 = 1 (§218) Prop. IV. Theorem 220. In any proportion, the terms are in proportion by Inver- sion ; that iSy the second term is to the first as the fourth term is to the third.
Given the proportion - = -. (1) a To Prove ^ = ^.
a c Proof. From (1), ad = be. (?) Then, ^ = ^. (?) a c Prop. V. Theorem 221. In any proportion, the terms are in proportion by Com- position ; that is, the sum of the first two terms is to the first term as the sum of the last two terms is to the third term.


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