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錐體建築師
異分母分數減法
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
Opdag Ressourcer
橢圓與雙曲線折紙
Locus of mid-point of a variable chord of a circle.
倫敦滾石橋2
立體截面
Measuring Volume 4
Udforsk emner
Algebra
Trapez
Plane figurer eller former
Trekanter
Pyramide