Model Of Geometric Proportions Small 320×234 Medium 640×467 Large 1024×748 Download Tiff Original 2400×1753 | (218.8 KB) Description An illustration showing a model that illustrates the following relationships: a:b = c:d, ad = bc. Product of the means equals the product of the extremes. Keywords cross-multiplying, extremes, geometric relationships, means, model of geometric proportions, polygon relationships, proof, proportion, quadrilateral, theorem Galleries Geometric Theorems and Proofs Source: Albert A. Hopkins Scientific America: Handy Book Of Facts And Formulas (New York: Munn & Co., Inc., 1918) 41
