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3.21 Arcs in Isometric

The four-center ellipse construction can be used to sketch or draw circular arcs in isometric. Figure 3.53a shows the complete construction. It is not necessary to draw the complete constructions for arcs, as shown in Figures 3.53b and c. Measure the radius R from the construction corner, then at each point, draw perpendiculars to the lines. Their intersection is the center of the arc. Note that the R distances are equal in Figures 3.53b and c, but that the actual radii used are quite different.


3.53 Arcs in Isometric

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