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四角形を三角形に変形して求積
Author:
nm1981
Topic:
Area
,
Constructions
,
Quadrilaterals
,
Triangles
GeoGebra
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２次関数(片側移動)
ベジェ曲線
円柱の切断(軸をふくむ平面)
動くミニビースト
No,40-問３
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