Level 20

Autore: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.

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Graphing 1 + cos(θ) in Polar Coordinates
Untitled
Tangent in Cartesian and Polar Coordinates
Special Right Triangles 30°-60°-90° and 45°-45°-90°

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two reflections is a rotation
theorem 4
projectile
Solutions of Inequalities: IM 6.7.9

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Matrici
Area
Ellisse
Piani
Calcolo integrale