Question

Prove $|x + y|^2 + |x - y|^2 = 2|x|^2 + 2|y|^2$ and interpret its meaning.

score 1.6k · Answer 1 · 2026-04-16 02:50:26

1.6k

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Prove $|x + y|^2 + |x - y|^2 = 2|x|^2 + 2|y|^2$ and interpret its meaning.

Published on 16 Apr 2026 - 2:50

score 1.6k · Answer 2 · 2026-04-13 10:19:11

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About the ratio of the areas of a convex pentagon and the inner pentagon made by the five diagonals

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score 3.8k · Answer 3 · 2026-04-16 04:44:52

3.8k

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Finding the length of a side of a quadrilateral given 2 sides and two angles

Published on 16 Apr 2026 - 4:44

score 6.6k · Answer 4 · 2026-04-11 21:45:13

6.6k

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Calculating the Euclidean Distance

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score 4.5k · Answer 5 · 2026-04-25 11:25:26

4.5k

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Why do we believe the equation $ax+by+c=0$ represents a line?

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score 9.1k · Answer 6 · 2026-04-11 17:27:49

9.1k

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Does a rhombus bisector creating two equal triangles by reflection imply a square?

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score 750 · Answer 7 · 2026-03-27 03:49:04

750

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Circle of Apollonius proof question

Published on 27 Mar 2026 - 3:49

score 1.2k · Answer 8 · 2026-04-12 06:34:05

1.2k

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How to find the affine transformation(s) ( if any ) that maps one quadrilateral into another.

Published on 12 Apr 2026 - 6:34

score 1.6k · Answer 9 · 2026-04-12 20:42:12

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How to find a point along an vector at a variable distance

Published on 12 Apr 2026 - 20:42

score 53 · Answer 10 · 2026-03-27 19:43:35

53

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In search of a symmetric homogeneous graph with a pivotal origin

Published on 27 Mar 2026 - 19:43

score 366 · Answer 11 · 2026-04-11 16:35:43

366

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How can I estimate the Euclidean distance?

Published on 11 Apr 2026 - 16:35

score 2.2k · Answer 12 · 2026-04-13 18:58:24

2.2k

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a conjugate of a glide reflection by any isometry of the plane is again a glide reflection

Published on 13 Apr 2026 - 18:58

score 274 · Answer 13 · 2026-05-04 17:55:18

274

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Lines $ MF, DE, QR$ in a triangle intersect at one point

Published on 04 May 2026 - 17:55

score 1.7k · Answer 14 · 2026-04-13 02:43:55

1.7k

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Why are the axis labelled as such in the 3d Cartesian coordinate system?

Published on 13 Apr 2026 - 2:43

score 53 · Answer 15 · 2026-04-10 19:57:54

53

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Would it make sense to talk about approximated constructions in euclidean geometry?

Published on 10 Apr 2026 - 19:57

List Question

Prove $|x + y|^2 + |x - y|^2 = 2|x|^2 + 2|y|^2$ and interpret its meaning.

About the ratio of the areas of a convex pentagon and the inner pentagon made by the five diagonals

Finding the length of a side of a quadrilateral given 2 sides and two angles

Calculating the Euclidean Distance

Why do we believe the equation $ax+by+c=0$ represents a line?

Does a rhombus bisector creating two equal triangles by reflection imply a square?

Circle of Apollonius proof question

How to find the affine transformation(s) ( if any ) that maps one quadrilateral into another.

How to find a point along an vector at a variable distance

In search of a symmetric homogeneous graph with a pivotal origin

How can I estimate the Euclidean distance?

a conjugate of a glide reflection by any isometry of the plane is again a glide reflection

Lines $ MF, DE, QR$ in a triangle intersect at one point

Why are the axis labelled as such in the 3d Cartesian coordinate system?

Would it make sense to talk about approximated constructions in euclidean geometry?

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