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Peaucellier linkage
Author:
Yudong Liu
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Parallelogram Properties
Marble
Interior and Exterior Angle Sum of a Triangle
Transformations
A2_6.03 Trigonometric identities
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Area of a Circle
Cissoid of Diocles
Line Symmetry 1
coplanar and point and lines
從1~20，選出7個不同的自然數，令到下列分數之和為1。
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Arithmetic
Conditional Probability
Geometric Distribution
Combinatorics
Probability