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作者：
girffe
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Building Parallelograms with Set Areas
Building Trapezoids with Set Areas
Publish app "Public" test
Pathway to Proof: Triangle Angles
Building Triangles with Set Areas
探索資源
definicija15.2.2
qawsas
Proof Pythagorean Thm
Figure 9.8b Risk and Return
#101
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圓
立方（體）
複數
球形
三角學