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等積変形 p140 問題5 四角形を三角形に
Author:
宇
GeoGebra
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standingwave-reflection-free
正17角形 作図 regular 17-gon 2
standingwave-plus
sine-wave
小テスト
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いろいろな四角形_改
傍接楕円
人間(未訂正)
H30実力1図形
面積の等しい三角形を見つける(等積変形)
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Kite
Square
Parabola
Sequences and Series
Isosceles Triangles