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selection task 1
Author:
Arthur Lee
找出平行線，把它們移到右邊。
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Flip A Bunch of Coins
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Flip 5 Coins.
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مركز الأبعاد المتناسبة لثلاث نقط
part B, question 5: perp. line from centre bisects chord
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Geometry Lesson 4.5 Example 1
A.1.11.3 Visual Variability and Statistics (part 1)
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Sequences and Series
Cuboid
Tangent Line or Tangent
Line Segment
Similar Triangles