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鐘面的時間（時和分）YLMAY
Author:
Ay
New Resources
Sliced Cube
Reflection and Rotation
GeoGebra News - September 2021
Trig Reference Circle: Choose Your Own Radius
PR2-SIVM-CYU2
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act_dom_rng_dom-intro
upper and lower limits by Michael Borcherds
Snowglobe1
Percentage Change
Picture Construction 1 of Proportional Sides Theorem
Discover Topics
Kite
Standard Deviation
Optimization Problems
Frequency Distribution
Angles