Where there are lines, there are often angles! Here, you will discover how to measure and construct angles yourself. Of course, you will need a tool, the protractor. Angles may even save your life one day, as the compass did for many great explorers.
多媒體：
多媒體
互動練習
版面：
固定
插圖：
許多
關鍵字詞： Mathematics | geometry | measurement | angle | protractor | degrees | construction