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perpendicular lines and their slopes

Author:Yip Wing Chung, Felix

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Volume by Disk/Washer around y
bewijs stelling van Pythagoras
Reflection across a line
Reflection = 180° Rotation about a Line
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T2 ex 42 page 134
Stereographic projection
Condition of parallelism and perpendicularity of lines in terms of their slopes
Step 4
equilateral

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