List questions from euclidean-geometry

104

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How can I prove the eccentricity of a quadratic conic is invariant under bijective affine transformations?

Published on 25 Mar 2026 - 18:49

9k

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Difference between Haversine and Euclidean Distance

Published on 30 Oct 2018 - 19:36

35

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maximum surface

Published on 30 Oct 2018 - 23:36

62

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Solving the equations in three variables

Published on 25 Mar 2026 - 7:40

94

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Theorem on triangle

Published on 27 Mar 2026 - 21:44

170

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Locus of a vertex defining a circle intrinsic to a triangle

Published on 27 Mar 2026 - 4:38

137

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How to prove that AE is the arithmetic mean of AB and AC

Published on 27 Mar 2026 - 21:59

46

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A question about Euclidean spaces.

Published on 31 Oct 2018 - 22:55

324

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Number of Intersection points between lower half of an ellipse and a circle

Published on 27 Mar 2026 - 4:38

102

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What is the angle from (0,0) to (longitude, latitude)?

Published on 25 Mar 2026 - 20:52

29

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First to prove theorem relating distance to the center of mass of configuration given distance matrix

Published on 25 Mar 2026 - 19:51

229

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Find a locus of points

Published on 26 Mar 2026 - 19:16

200

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How to solve for $\angle BDC$ given the information of other angles in the picture

Published on 02 Nov 2018 - 4:24

223

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A novel (?) construction of the regular pentagon with straightedge and compass

Published on 25 Mar 2026 - 12:54

91

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can someone help in solving this triangle-circumcircle question?

Published on 27 Mar 2026 - 21:54

List Question

How can I prove the eccentricity of a quadratic conic is invariant under bijective affine transformations?

Difference between Haversine and Euclidean Distance

maximum surface

Solving the equations in three variables

Theorem on triangle

Locus of a vertex defining a circle intrinsic to a triangle

How to prove that AE is the arithmetic mean of AB and AC

A question about Euclidean spaces.

Number of Intersection points between lower half of an ellipse and a circle

What is the angle from (0,0) to (longitude, latitude)?

First to prove theorem relating distance to the center of mass of configuration given distance matrix

Find a locus of points

How to solve for $\angle BDC$ given the information of other angles in the picture

A novel (?) construction of the regular pentagon with straightedge and compass

can someone help in solving this triangle-circumcircle question?

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