The "Right" Triangle

Pity poor professor Mali Kilter making that difficult climb to the top of the eucalyptus tree. If that's not difficult enough, then he needs to drop a plumb line straight down to the ground without it hitting and being deflected by any one of those big branches. Had he paid more

attention to the teacher during his ninth-grade geometry class, he would have remembered something special about a triangle with one right angle.

If the hypotenuse of this triangle meets each of the two sides at a 45 degree angle, then the two sides are equal in length.

To measure the height of the tree, all he needs to do is back away from the tree until he can sight the top while looking at his protractor set at 45 degrees. His distance from the tree is equal to the height of the tree.

Simeon Ross Greenlawn, New York

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Wood Working for Amateur Craftsman

Wood Working for Amateur Craftsman

THIS book is one of the series of Handbooks on industrial subjects being published by the Popular Mechanics Company. Like Popular Mechanics Magazine, and like the other books in this series, it is written so you can understand it. The purpose of Popular Mechanics Handbooks is to supply a growing demand for high-class, up-to-date and accurate text-books, suitable for home study as well as for class use, on all mechanical subjects. The textand illustrations, in each instance, have been prepared expressly for this series by well known experts, and revised by the editor of Popular Mechanics.

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