A complete and practical solution book for the common school teacher (1899)
Fairchild, J[ohn] T[heodore] [from old catalog] · Crawfis College, Ohio, The author · leaf 217
IX. PARALLELOGRAMS AND SOLIDS. 100. A Parallelogram is a quadrilateral whose opposite sidesare parallel. 101. A Rectangle is a parallelogram whose angles are allright angles. 102. A Rhombus is a quadrilateral whose sides are equal. 103. A Square is a rectangle whose sides are all equal. PROBLEM… … FIG. 3. PROBLEM 400.What is the side of a square whose diagonal is 20 ft.? Solution. (1) 20 ft.=diagonal. (2) 20 ft.-W2=i4.84 ft. = side of the square.Rule.—Divide the diagonal by the \/2. *This shows that the square of the diagonal of a square is equal totwice the square of one side, or twice the…
Arithmetic · Geometry
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