List questions from euclidean-geometry

Published on 26 Mar 2026 - 19:03

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Finding the values of $x$ and $y$ for which $x^2 + y^2$ is a minimum

Published on 25 Mar 2026 - 17:40

1.9k

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Proving that congruent triangles have equal area

Published on 27 Mar 2026 - 10:07

55

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Geometrical proof of the impossibility of angle trisection by straightedge and compass

Published on 25 Mar 2026 - 1:38

1.4k

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Find angle UFO in the picture attached

Published on 27 Mar 2026 - 0:02

102

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Triangles : isoceles and angles inside with other triangle

Published on 03 Sep 2018 - 20:11

171

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Visualizations of the (potential) irrationality of $\sqrt{2}$

Published on 25 Mar 2026 - 1:31

650

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Area of triangle formed by the feet of the altitudes.

Published on 04 Sep 2018 - 15:05

61

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a theoretical question regarding parallelogram and ratio of intersection of a line segment in it by a diagonal

Published on 04 Sep 2018 - 17:27

98

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Prove that $P_1P_2P_3=2rR^2$.

Published on 27 Mar 2026 - 7:14

183

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Given two trapezoids of equal area, show that the length of FB is (a^2 + b^2) / 2

Published on 25 Mar 2026 - 7:44

96

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An optimization problem in Euclidean Geometry - finding "the smallest" inscribed triangle

Published on 04 Sep 2018 - 23:09

3.7k

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What is the name of this result about isosceles triangles?

Published on 27 Mar 2026 - 10:31

96

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Computing a Geometrical ratio $\frac{a}{b}$.

Published on 27 Mar 2026 - 16:54

368

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Prove that translation is linear transformation iff orthogonal projection on subspace $U^\bot$, is injective

Published on 06 Sep 2018 - 12:23

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small circle area

Finding the values of $x$ and $y$ for which $x^2 + y^2$ is a minimum

Proving that congruent triangles have equal area

Geometrical proof of the impossibility of angle trisection by straightedge and compass

Find angle UFO in the picture attached

Triangles : isoceles and angles inside with other triangle

Visualizations of the (potential) irrationality of $\sqrt{2}$

Area of triangle formed by the feet of the altitudes.

a theoretical question regarding parallelogram and ratio of intersection of a line segment in it by a diagonal

Prove that $P_1P_2P_3=2rR^2$.

Given two trapezoids of equal area, show that the length of FB is (a^2 + b^2) / 2

An optimization problem in Euclidean Geometry - finding "the smallest" inscribed triangle

What is the name of this result about isosceles triangles?

Computing a Geometrical ratio $\frac{a}{b}$.

Prove that translation is linear transformation iff orthogonal projection on subspace $U^\bot$, is injective

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