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Level 20
Author:
Colin Beveridge
Level 20 of
http://euclidthegame.org/Level20.html
asks you to construct the outer tangent to two given circles (here, a, with centre A; and b, with centre B). Here's how I'd do it.
GeoGebra
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探究由平行線和截線所成的角
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e part 2
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