Sundararajan – Resources – GeoGebra

British Flag Theorem
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Sundararajan
Sangaku problem: two tangents to a circle
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Sundararajan
Thales' theorem
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Sundararajan
Ceva's theorem
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Sundararajan
Varignon's theorem
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Sundararajan
Integral and area under the curve
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Sundararajan
Derivative as slope
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Sundararajan