Surfaces that can be represented by equations of degree two – spheres, ellipsoids, paraboloids, hyperboloids, and cones – have long been discussed in courses on descriptive and solid geometry, ...
Children can normally be expected to copy a circle at 3, a square at 4, and a triangle at 5 years of age on standard 8½ X 11-inch paper. This study hypothesized that the shape of the background paper ...
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