| 摘要 |
<p>The draughtsman's set square is used in the architectural field for direct derivation of the 'gold section' giving building elements harmonious proportions. It has a right angled triangular shape with the remaining angles (ABC & ACB) subtending 58 degrees 16' 57.09" and 31 degrees 43' 2.91", the ratio of the sides (AC,AB) subtending the right angle being 1:0.618034.</p> |
