The 9-point Conic

作成者:Steve Phelps

In a complete quadrilateral, the midpoints of the six sides (AB, BC, CD, DA, BD, and CA) and the three intersections of the opposite sides (E, F, and G) - nine points in total - lie on a conic.

新しい教材

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Slope Between 2 Points (Phase 2)
Discriminant of y = ax² + bx + c
Graphs of Rational Expressions
Riemann Sums

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Problem 114
تنصيف زاوية معلومة_Elmasry
Hexagon - Katie Wright
Spinning circular arcs
hex tri 2 1 II
area

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球面
割り算
移動・変換
直線・線分
ランダムな実験