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S3 centre(orthocentre)
Author:
lwa
GeoGebra
New Resources
Flip Flop
Periodic Functions
Road Runner (beep, beep)
alg2_05_05_01_applet_exp_2_flvs
探究由平行線和截線所成的角
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Parts of Circle (old)
Parallel lines with transversal and angles
Mandala
Chord Theorem 4
spherical kite
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Histogram
Terms
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Equilateral Triangles
Trapezoid