Question

Is there a geometric proof of $\frac1r = \frac{1}{h_a} + \frac{1}{h_b} + \frac{1}{h_c}$ in a given triangle?

score 106 · Answer 1 · 2026-03-30 23:52:56

106

Views

Is there a geometric proof of $\frac1r = \frac{1}{h_a} + \frac{1}{h_b} + \frac{1}{h_c}$ in a given triangle?

Published on 30 Mar 2026 - 23:52

score 1.1k · Answer 2 · 2026-03-29 17:59:40

1.1k

Views

One angle in a triangle is twice the other, find the relationship among the sides

Published on 29 Mar 2026 - 17:59

score 504 · Answer 3 · 2026-03-25 03:20:24

504

Views

Euclidean geometry problem from Euclidean and Non Euclidean Geometry: An Analytic Approach by Patrick J Ryan

Published on 25 Mar 2026 - 3:20

score 42 · Answer 4 · 2026-03-26 12:58:02

42

Views

What solid does the truncation of an icosahedron approach?

Published on 26 Mar 2026 - 12:58

score 57 · Answer 5 · 2026-02-23 12:09:15

57

Views

Why is $\mathbb{R}^2$ endowed with the taxicab metric isomorphic to the infinity distance model of the cartesian real plane? (Hartshorne exercise 8.9)

Published on 23 Feb 2026 - 12:09

score 117 · Answer 6 · 2019-04-15 01:21:21

117

Views

Euclidean Geometry Translations

Published on 15 Apr 2019 - 1:21

score 411 · Answer 7 · 2026-03-28 17:25:46

411

Views

How to find the location of a point in 3D space from projected 2D angle

Published on 28 Mar 2026 - 17:25

score 111 · Answer 8 · 2026-03-26 07:59:03

111

Views

How can I find the sum of the angle $AMB$, angle $ANB$ and the angle $ACB$?

Published on 26 Mar 2026 - 7:59

score 66 · Answer 9 · 2026-03-26 09:58:09

66

Views

Why does the formula for the volume of a rhombic triacontahedron contain $\sqrt{5}$?

Published on 26 Mar 2026 - 9:58

score 8.2k · Answer 10 · 2019-04-16 00:56:46

8.2k

Views

Coordinates of the incenter of a triangle

Published on 16 Apr 2019 - 0:56

score 50 · Answer 11 · 2026-03-29 08:20:56

50

Views

Minimizing lengths of cevians in an isosceles right triangle

Published on 29 Mar 2026 - 8:20

score 108 · Answer 12 · 2019-04-16 11:36:45

108

Views

Stuck on a Geometry Problem (II)

Published on 16 Apr 2019 - 11:36

score 138 · Answer 13 · 2019-04-16 12:50:11

138

Views

Find $\angle BDA$

Published on 16 Apr 2019 - 12:50

score 265 · Answer 14 · 2019-04-17 11:36:51

265

Views

Prove that the shortest path between two points in a Euclidean space is a straight line.

Published on 17 Apr 2019 - 11:36

score 243 · Answer 15 · 2026-03-29 17:59:39

243

Views

Find $P$ in the plane of $\triangle ABC$ that minimizes $a\,AP^2+b\,BP^2+c\,CP^2$

Published on 29 Mar 2026 - 17:59

List Question

Is there a geometric proof of $\frac1r = \frac{1}{h_a} + \frac{1}{h_b} + \frac{1}{h_c}$ in a given triangle?

One angle in a triangle is twice the other, find the relationship among the sides

Euclidean geometry problem from Euclidean and Non Euclidean Geometry: An Analytic Approach by Patrick J Ryan

What solid does the truncation of an icosahedron approach?

Why is $\mathbb{R}^2$ endowed with the taxicab metric isomorphic to the infinity distance model of the cartesian real plane? (Hartshorne exercise 8.9)

Euclidean Geometry Translations

How to find the location of a point in 3D space from projected 2D angle

How can I find the sum of the angle $AMB$, angle $ANB$ and the angle $ACB$?

Why does the formula for the volume of a rhombic triacontahedron contain $\sqrt{5}$?

Coordinates of the incenter of a triangle

Minimizing lengths of cevians in an isosceles right triangle

Stuck on a Geometry Problem (II)

Find $\angle BDA$

Prove that the shortest path between two points in a Euclidean space is a straight line.

Find $P$ in the plane of $\triangle ABC$ that minimizes $a\,AP^2+b\,BP^2+c\,CP^2$

Trending Questions

Popular # Hahtags

Popular Questions