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242 多角形の内角の和
Author:
久保塾 今治
GeoGebra
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サイクロイド
standingwave-reflection-free
standingwave-plus
対数螺旋
sine-wave
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分数正多角形 Fractional regular polygon
整式の割り算の問題
共通部分と和集合（intersection and union）
x^2+y^2+ax+by=c
円周角と中心角の関係
回転体－球
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Pythagoras or Pythagorean Theorem
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