Quiz on Formula about Area and Volume 面積及體積公式：測驗
Click the correct formula in each question. There are 24 questions in total. You can observe the figures in different angles.
點擊正確的公式。共24題。拖拉滑鼠右鍵或於平板電腦中以兩隻手指拖拉可以不同角度觀察立體圖形。
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