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斜率
Author:
wong kam cheung
GeoGebra
New Resources
四邊形的特性
三位數除以一位數（二）
拼砌四邊形
異分母分數減法
兩組對邊相等和有直角的四邊形
Discover Resources
Angle of Elevation & Angle of Depression 仰角和俯角
SIN繪圖
光的反射
三角形面積公式A
正三角疊代
Discover Topics
Pythagoras or Pythagorean Theorem
Secant Line or Secant
Logic
Difference and Slope
Vectors 2D (Two-Dimensional)