Industrial drawing and geometry; an introduction to various branches of technical drawing (1911)
Spooner, Henry John, 1856- · London, New York [etc.] Longmans, Green, and co. · leaf 49
C, Oi A ; C ::C : B. As you will remember, the product of the extremes (firstand fourth terms) of any proportion is equal to the product of themeans (second and third terms). 2. The mean proportional C is called the geometrical mean ofA and B. The area of a square on C is equal to the area of… … Pig. 86.—Mean proportional. Pig. 87.—Square and rectangle equal in area. 3. Yoh should study the relation the above problem bears to Problem 61. 4. When B equals unity, C wiU equal the ,,/A, and the length of the line A represents the area of the rectangle formed by A and B. 5. The line 1 5 is the…
Mechanical drawing · Geometrical drawing
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