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Perpendicular lines

Author:Ng KC

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球體建築師
判斷球體
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
四邊形的特性

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task 7
test1(尋找北極星)
不規則形陰影作圖2
Ex5D#6
congruent (SSA, RHS)

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Subtraction
Linear Functions
Statistics
Combinatorics
Equilateral Triangles

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