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The circle H which touches the incircles I, I_A, I_B, and I_C of a circular triangle ABC and its associated triangles. It is either externally tangent to I and internally ...
A right strophoid is the strophoid of a line L with pole O not on L and fixed point O^' being the point where the perpendicular from O to L cuts L is called a right ...
Take any triangle with polygon vertices A, B, and C. Pick a point A_1 on the side opposite A, and draw a line parallel to BC. Upon reaching the side AC at B_1, draw the line ...
An Andreini tessellation is a three-dimensional equivalent of a semiregular tessellation. There are 28 such tessellations.
A circle with an arrow indicating a direction.
K=-e^2, where e is the eccentricity of a conic section.
The star polygon {10/3}.
The star polygon {12/5}.
The product of three translations along the directed sides of a triangle through twice the lengths of these sides is the identity map.
Not concentric.
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