| 摘要 |
A designer's triangle providing for the selection of angles from 15 to 90 degrees in a single implement, in increments of 15 degrees or less, and further including provisions for draft or taper angles to vary the aforesaid angles. Further embodiments include metric, fractional and tenth of inch embossed scales, protection against smudging, and marked or designated radii at a plurality of points on the triangle.
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