Question

Conditions for intersection of plane in $\mathbb{R}^3$ with unit sphere to be circle

score 142 · Answer 1 · 2026-03-28 22:28:17

142

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Conditions for intersection of plane in $\mathbb{R}^3$ with unit sphere to be circle

Published on 28 Mar 2026 - 22:28

score 155 · Answer 2 · 2017-01-25 03:09:30

155

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Two subsets of the plane?

Published on 25 Jan 2017 - 3:09

score 440 · Answer 3 · 2017-01-28 11:52:47

440

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Plane and Line Distance

Published on 28 Jan 2017 - 11:52

score 172 · Answer 4 · 2017-01-29 14:52:06

172

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Simply Connected Sets in the Plane and Cross-Cuts

Published on 29 Jan 2017 - 14:52

score 167 · Answer 5 · 2026-03-29 05:11:54

167

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BdMO 2014 National Secondary Problem 6

Published on 29 Mar 2026 - 5:11

score 1.5k · Answer 6 · 2017-01-30 21:48:39

1.5k

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How to tell where a ray intersects with a plane in 3D space

Published on 30 Jan 2017 - 21:48

score 87 · Answer 7 · 2017-01-31 22:17:58

87

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Find the equation of the plane that contains the point $Q(1,2,5)$ and is parallel to the plane $2x-z= 1$.

Published on 31 Jan 2017 - 22:17

score 206 · Answer 8 · 2017-02-01 03:48:35

206

Views

Nonorthogonal decomposition of a vector in terms of orthogonal projections

Published on 01 Feb 2017 - 3:48

score 73 · Answer 9 · 2017-02-01 06:18:54

Prove that the value of $\angle BAC$ is equal to half the difference of the angle measures of the arcs of the circle confined inside this angle.

score 163 · Answer 10 · 2017-02-02 03:32:41

163

Views

Elegantly latticed triangle centers

Published on 02 Feb 2017 - 3:32

score 562 · Answer 11 · 2017-02-02 10:21:05

562

Views

Archimedes problem about the broken chord

Published on 02 Feb 2017 - 10:21

score 561 · Answer 12 · 2017-02-04 15:30:08

561

Views

Prove that three points A, B, C are collinear

Published on 04 Feb 2017 - 15:30

score 33 · Answer 13 · 2017-02-07 21:05:49

33

Views

$\angle ABC = \angle AKC = 90^\circ$, Find length of $BK$.

Published on 07 Feb 2017 - 21:05

score 51 · Answer 14 · 2017-02-07 22:16:29

51

Views

Prove that if and only if $AA_1, BB_1, CC_1$ are the bisectors of angles of $ABC$ then they are the heights of $A_1B_1C_1$

Published on 07 Feb 2017 - 22:16

score 54 · Answer 15 · 2017-02-08 09:55:08

54

Views

Intuitive explanation how scalar multiplication of vectors works

Published on 08 Feb 2017 - 9:55

List Question

Conditions for intersection of plane in $\mathbb{R}^3$ with unit sphere to be circle

Two subsets of the plane?

Plane and Line Distance

Simply Connected Sets in the Plane and Cross-Cuts

BdMO 2014 National Secondary Problem 6

How to tell where a ray intersects with a plane in 3D space

Find the equation of the plane that contains the point $Q(1,2,5)$ and is parallel to the plane $2x-z= 1$.

Nonorthogonal decomposition of a vector in terms of orthogonal projections

Prove that the value of $\angle BAC$ is equal to half the difference of the angle measures of the arcs of the circle confined inside this angle.

Elegantly latticed triangle centers

Archimedes problem about the broken chord

Prove that three points A, B, C are collinear

$\angle ABC = \angle AKC = 90^\circ$, Find length of $BK$.

Prove that if and only if $AA_1, BB_1, CC_1$ are the bisectors of angles of $ABC$ then they are the heights of $A_1B_1C_1$

Intuitive explanation how scalar multiplication of vectors works

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