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Copy of Triangular Numbers
Author:
Edmond So
,
Gareth Daniels
Use the input box to choose a value for
n
.
GeoGebra
Try to work out a formula to find the number of red circles in the
n
th pattern.
GeoGebra
New Resources
alg2_05_05_01_applet_exp_flvs
Poorly Drawn Parallelograms 3
探究由平行線和截線所成的角
Explore the invariant lines of matrix {{-2,5},{6,-9}}
Droste effect
Discover Resources
standeyo_1
A hyperbola
Olimpiada Baia Mare 1.
DM_PtoQ
Line (Segment) from Center to a Chord
Discover Topics
Straight Lines
Diagrams
Confidence Interval
Cosine
Random Variables