chiefly Brit a flat triangular instrument with one right angle and two other angles of known size, usu 45° or 30° and 60°, used to mark out or test angles
| 单词 | set square |
| 释义 | set squarenounchiefly Brit a flat triangular instrument with one right angle and two other angles of known size, usu 45° or 30° and 60°, used to mark out or test angles |
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