中文版：http://www.geogebratube.org/material/show/id/2456 (Download GeoGebra file) 利用以下的量角器量度所示的角。 將量角器拖拉到合適的位置，拖拉紅點轉動它。 拖拉綠點調整角的位置和大小。
Demonstrate how to use the protractor to measure an angle. English version: http://www.geogebratube.org/material/show/id/2461 (Download GeoGebra file) Measure the angle using the protractor. Drag the protractor to appropriate position. Drag the red point to rotate it. |
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