我们通常使用的量角器,只能精确到1度或半度。能否制作精确到分或秒的量角器呢?答案是肯定的。做一把半径很大的量角器,只要在1度的圆弧内划上60条等分刻度线,就能精确到1分,苦能划上3600条等分刻度线,就能精确到1秒。但是,这种量角器太大,使用不方便。 We usually use the protractor, only accurate to 1 degree or half. Is it possible to make protractor accurate to minutes or seconds? The answer is yes. To make a large radius of the protractor, as long as the circle in the arc of 1 arc 60 ticks, you can accurately 1 minute, hard to draw 3600 bisecting lines, you can be accurate to 1 second . However, this protractor is too large and inconvenient to use.