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.
利用以下的量角器量度所示的角。
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Key Stage 3 (Junior Secondary) > 3.2 Measures, Shape & Space 度量、圖形與空間 > Introduction to Geometry 幾何簡介 >