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平行光线下物高与影长的关系
Author:
刘恒绪
GeoGebra
New Resources
Forming Similar Triangles
從邊長辨認四邊形
Intercepts in 3D
Pythagorean Day
Colors for GeoGebra
Discover Resources
Thomson2
Teorema Menelaus.
Italia: sucesión 4
Chord is at Right Angles to the Radius
DGMC
aplet v2.4
Discover Topics
Ratios
Statistical Characteristics
Frequency Distribution
Kite
Natural Numbers