Question

What are the conditions for zero to belong to a convex hull of a set of points

score 590 · Answer 1 · 2018-08-28 13:00:27

590

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What are the conditions for zero to belong to a convex hull of a set of points

Published on 28 Aug 2018 - 13:00

score 64 · Answer 2 · 2026-03-25 04:40:40

64

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Determining whether proofs of the Pythagorean theorem are essentially the same, or essentially different

Published on 25 Mar 2026 - 4:40

score 187 · Answer 3 · 2026-03-25 16:46:29

187

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How would Euclid have proved that $ a \times b = ((ab)/c) \times c$?

Published on 25 Mar 2026 - 16:46

score 698 · Answer 4 · 2026-03-26 19:02:53

698

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What is isogonal family of a given family of curves?

Published on 26 Mar 2026 - 19:02

score 43 · Answer 5 · 2018-08-30 00:26:54

43

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For $A \in \mathbb{R}^2$. Assume A + A = $0$. Prove that A = $0$ using only vector space axioms.

Published on 30 Aug 2018 - 0:26

score 61 · Answer 6 · 2026-03-25 04:40:32

61

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Change of angle inside a quirky hexagon

Published on 25 Mar 2026 - 4:40

score 917 · Answer 7 · 2018-08-30 21:14:00

917

Views

Prove the midpoint formula using only the vector space axioms.

Published on 30 Aug 2018 - 21:14

score 865 · Answer 8 · 2026-03-26 01:16:41

865

Views

3D lattice of a tetrahedron. What is it called?

Published on 26 Mar 2026 - 1:16

score 46 · Answer 9 · 2026-03-27 10:10:45

46

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A modern alternative to Euclid's definition of polygons

Published on 27 Mar 2026 - 10:10

score 38 · Answer 10 · 2018-08-31 17:07:54

38

Views

Intersection of two chords

Published on 31 Aug 2018 - 17:07

score 196 · Answer 11 · 2026-03-26 19:02:48

196

Views

$ABCD$ a tetrahedron. $P$ and $Q$ be points on the sides $AB$ and $CD$ respectively. What is the locus of the midpoint of the line segment $PQ$?

Published on 26 Mar 2026 - 19:02

score 136 · Answer 12 · 2026-03-25 12:48:42

136

Views

Let $ABCD$ be a parallelogram. Show that $\angle BQD = 90^ \circ$.

Published on 25 Mar 2026 - 12:48

score 122 · Answer 13 · 2026-03-27 16:17:31

122

Views

Prove: the ratio between the areas of $ABC$ and $AB'C'$ is $AB'\cdot\frac{AC'}{(AC \cdot AB)}$

Published on 27 Mar 2026 - 16:17

score 86 · Answer 14 · 2018-09-02 08:41:50

86

Views

Simple Looking Problem in Geometry

Published on 02 Sep 2018 - 8:41

score 118 · Answer 15 · 2018-09-02 17:14:34

118

Views

Four points on the plane are vertices of three quadrilaterals. Explain how this happens.

Published on 02 Sep 2018 - 17:14

List Question

What are the conditions for zero to belong to a convex hull of a set of points

Determining whether proofs of the Pythagorean theorem are essentially the same, or essentially different

How would Euclid have proved that $ a \times b = ((ab)/c) \times c$?

What is isogonal family of a given family of curves?

For $A \in \mathbb{R}^2$. Assume A + A = $0$. Prove that A = $0$ using only vector space axioms.

Change of angle inside a quirky hexagon

Prove the midpoint formula using only the vector space axioms.

3D lattice of a tetrahedron. What is it called?

A modern alternative to Euclid's definition of polygons

Intersection of two chords

$ABCD$ a tetrahedron. $P$ and $Q$ be points on the sides $AB$ and $CD$ respectively. What is the locus of the midpoint of the line segment $PQ$?

Let $ABCD$ be a parallelogram. Show that $\angle BQD = 90^ \circ$.

Prove: the ratio between the areas of $ABC$ and $AB'C'$ is $AB'\cdot\frac{AC'}{(AC \cdot AB)}$

Simple Looking Problem in Geometry

Four points on the plane are vertices of three quadrilaterals. Explain how this happens.

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