Question

Problem showing that $\chi(G) \le 3$ constructing $G$ from a finite set of lines and maybe using greedy algorithm

score 190 · Answer 1 · 2020-05-27 03:55:11

190

Views

Problem showing that $\chi(G) \le 3$ constructing $G$ from a finite set of lines and maybe using greedy algorithm

Published on 27 May 2020 - 3:55

score 311 · Answer 2 · 2026-03-25 22:11:18

311

Views

Area of a triangle as a function of its bisectors.

Published on 25 Mar 2026 - 22:11

score 67 · Answer 3 · 2020-06-02 14:05:42

67

Views

Check collinearity in 3D if points are noisy

Published on 02 Jun 2020 - 14:05

score 520 · Answer 4 · 2020-06-03 16:12:41

520

Views

Can two planes in $\mathbb{R}^4$ not intersect and also not be parallel?

Published on 03 Jun 2020 - 16:12

score 167 · Answer 5 · 2020-06-03 17:00:01

167

Views

Cartesian equation of plane containing point P(2,3,1) and at equal distance to three points A, B and C

Published on 03 Jun 2020 - 17:00

score 181 · Answer 6 · 2020-06-06 02:21:46

181

Views

A new(?) proof of the Law of Cosines using segments determined by the points of contact with a triangle's incircle

Published on 06 Jun 2020 - 2:21

score 300 · Answer 7 · 2020-06-11 06:23:41

300

Views

What is different between field , Vector function and plane?

Published on 11 Jun 2020 - 6:23

score 1.6k · Answer 8 · 2026-03-28 13:30:54

1.6k

Views

Geometry problem that can be complex-bashed

Published on 28 Mar 2026 - 13:30

score 272 · Answer 9 · 2020-06-13 22:17:51

272

Views

A geometry problem to prove three line segments intersect at the same point

Published on 13 Jun 2020 - 22:17

score 36 · Answer 10 · 2020-06-14 05:26:48

36

Views

Determine the type of object (e.g. lines or plane) given the intersection

Published on 14 Jun 2020 - 5:26

score 213 · Answer 11 · 2020-06-14 07:16:56

213

Views

Given a tetrahedron, whose sides are $AB=3,AC=4,BC=5,AD=6,BD=7,CD=8$ . Find the volume of the tetrahedral $ABCD$ .

Published on 14 Jun 2020 - 7:16

score 806 · Answer 12 · 2026-03-26 17:33:15

806

Views

Find the equation of the two tangent planes to the sphere $x^2+y^2+z^2-2y-6z+5=0$ which are parallel to the plane $2x+2y-z=0$

Published on 26 Mar 2026 - 17:33

score 487 · Answer 13 · 2026-03-27 01:00:15

487

Views

Olympiad question: In the regular pentagon $ABCDE$, the perpendicular at $C$ to $CD$ meets $AB$ at $F$. Prove that $AE + AF = BE$.

Published on 27 Mar 2026 - 1:00

score 484 · Answer 14 · 2020-06-18 10:09:23

484

Views

How to inscribe a square in an arbitrary quadrilateral using compass and straight edge

Published on 18 Jun 2020 - 10:09

score 142 · Answer 15 · 2020-06-18 16:23:48

142

Views

how to prove the segment $FH=HE$

Published on 18 Jun 2020 - 16:23

List Question

Problem showing that $\chi(G) \le 3$ constructing $G$ from a finite set of lines and maybe using greedy algorithm

Area of a triangle as a function of its bisectors.

Check collinearity in 3D if points are noisy

Can two planes in $\mathbb{R}^4$ not intersect and also not be parallel?

Cartesian equation of plane containing point P(2,3,1) and at equal distance to three points A, B and C

A new(?) proof of the Law of Cosines using segments determined by the points of contact with a triangle's incircle

What is different between field , Vector function and plane?

Geometry problem that can be complex-bashed

A geometry problem to prove three line segments intersect at the same point

Determine the type of object (e.g. lines or plane) given the intersection

Given a tetrahedron, whose sides are $AB=3,AC=4,BC=5,AD=6,BD=7,CD=8$ . Find the volume of the tetrahedral $ABCD$ .

Find the equation of the two tangent planes to the sphere $x^2+y^2+z^2-2y-6z+5=0$ which are parallel to the plane $2x+2y-z=0$

Olympiad question: In the regular pentagon $ABCDE$, the perpendicular at $C$ to $CD$ meets $AB$ at $F$. Prove that $AE + AF = BE$.

How to inscribe a square in an arbitrary quadrilateral using compass and straight edge

how to prove the segment $FH=HE$

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