Constructive Geometry Exercises in Elementary Geometric Drawing
Constructive Geometry Exercises in Elementary Geometric Drawing
E R Earle Raymond Hedrick
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22 CONSTRUCTIVE GEOMETRY 6. Draw nine parallels | in. Apart, and nine parallels perpendicular to them \ in. Apart. Shade the alternate squares to represent a checkerboard. An ornamental border may be placed around the whole figure, as in Ex. 5. 7. Mark several points A, B, C, D, etc. , on your paper. Draw lines through each of them parallel to the top edge of the paper by means of Ex. 3. Likewise draw lines parallel to one side edge of the paper through A, B, C, D. 8. To draw perpendiculars wit...h the drawing triangle. The right-angled corner of the drawing triangle may be used directly, as in Ex. I, p. 2. This gives blunt corners which are unsightly. A better result is obtained by using the triangle as in the accompanying figure. The principle is almost the same as in Ex. 3, but the triangle and the ruler are placed as shown in figure : the number i marks the first position of the triangle, fitting against the given line AB ; the number 2 marks the position of the ruler, fitting against the triangle ; the number 3 marks the second position of the triangle, after it has slid along the ruler to the given point P.
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