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start, create a 135 degree angle
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旋转得圆台
直方图案例
Quiz: Graphing Logarithmic Functions (Includes Transformations)
梯形折纸
赵爽弦图2
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Nested Stars
which is a better fit??
Planar graph of a dodecahedron
Base ten blocks w/ PV mat and digit cards (to millions)
Marta Flower
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Right Triangles
Natural Numbers
Isosceles Triangles
Fractions
Differential Calculus