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练习（点，斜率，直线）
Author:
朱亮
New Resources
Graph
basis for measurement: correspondence points to #
The damped harmonic oscillator nik
Impossible Pipe
Unit 3 Constructions - Copy an Angle
Discover Resources
Randomly Generated Right Triangles
Side - Side - Angle interaction
a perpendicular and angle bisector
Basic Hyperbola
test today
Discover Topics
Orthocenter
Area
Multiplication
Volume
Cylinder