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F1 triangle angle sum
Author:
Ngan Hok Hei
通過移動三角形的頂點﹐同學可以發現 不論是鈍角三角形﹐銳角三角形還是任何類形三角形, 三角形的內角總和仍然是180度。
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bug with first tool
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Pythagoras or Pythagorean Theorem
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