Question

proof that triangle have only one particular circumscribed circle

score 445 · Answer 1 · 2020-04-02 10:37:08

445

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proof that triangle have only one particular circumscribed circle

Published on 02 Apr 2020 - 10:37

score 44 · Answer 2 · 2020-04-02 18:09:01

44

Views

Using Pythagoras Theorem, find the value of $x$ in this triangle.

Published on 02 Apr 2020 - 18:09

score 220 · Answer 3 · 2026-04-03 17:32:21

220

Views

Parameters of the Mandart inellipse

Published on 03 Apr 2026 - 17:32

score 79 · Answer 4 · 2026-04-01 10:44:37

79

Views

How would I rigorously prove I can paint all lines of integers n?

Published on 01 Apr 2026 - 10:44

score 67 · Answer 5 · 2026-03-26 21:54:04

67

Views

$ \ \vec a × \vec b = \vec b × \vec c = \vec c × \vec a $ implies existance of a triangle

Published on 26 Mar 2026 - 21:54

score 211 · Answer 6 · 2026-03-25 06:02:18

211

Views

Proof that a spherical triangle is congruent with its dual

Published on 25 Mar 2026 - 6:02

score 30 · Answer 7 · 2020-04-05 14:45:45

If the sides $a, b, c $ form a successive geometric progression with common ratio $r(r>1)$, then prove that $A<B<\frac{\pi}{3}<C$

score 712 · Answer 8 · 2026-03-27 17:05:04

712

Views

How can I solve this geometry problem without trigonometry?

Published on 27 Mar 2026 - 17:05

score 715 · Answer 9 · 2020-04-06 10:46:28

715

Views

Let D, E, F be the feet of altitude from A, B, C in triangle ABC. Prove that the perpendicular bisector of ED also bisects BC.

Published on 06 Apr 2020 - 10:46

score 49 · Answer 10 · 2020-04-07 11:22:07

49

Views

Related to concurrence of lines in triangles

Published on 07 Apr 2020 - 11:22

score 51 · Answer 11 · 2026-03-28 08:38:06

51

Views

Problem using similarity of triangles (I guess).

Published on 28 Mar 2026 - 8:38

score 117 · Answer 12 · 2020-04-08 01:53:46

117

Views

For $D$ on side $BC$ of $\triangle ABC$, with $K$ and $L$ circumcenters of $\triangle ABD$ and $\triangle ADC$, show $\triangle ABC\sim \triangle AKL$

Published on 08 Apr 2020 - 1:53

score 104 · Answer 13 · 2026-04-02 22:13:43

104

Views

Prove that $DE\perp EF$.

Published on 02 Apr 2026 - 22:13

score 113 · Answer 14 · 2020-04-08 09:14:43

113

Views

What is the value of $BC^2$ in the following diagram?

Published on 08 Apr 2020 - 9:14

score 60 · Answer 15 · 2026-03-28 14:00:29

60

Views

Inversion in a plane; prove $P\left(\Delta A'B'C'\right)=\left[\frac{R^2}{(|OA||OB||OC|)^{\frac{1}{3}}}\right]^4P\left(\Delta ABC\right)$

Published on 28 Mar 2026 - 14:00

List Question

proof that triangle have only one particular circumscribed circle

Using Pythagoras Theorem, find the value of $x$ in this triangle.

Parameters of the Mandart inellipse

How would I rigorously prove I can paint all lines of integers n?

$ \ \vec a × \vec b = \vec b × \vec c = \vec c × \vec a $ implies existance of a triangle

Proof that a spherical triangle is congruent with its dual

If the sides $a, b, c $ form a successive geometric progression with common ratio $r(r>1)$, then prove that $A<B<\frac{\pi}{3}<C$

How can I solve this geometry problem without trigonometry?

Let D, E, F be the feet of altitude from A, B, C in triangle ABC. Prove that the perpendicular bisector of ED also bisects BC.

Related to concurrence of lines in triangles

Problem using similarity of triangles (I guess).

For $D$ on side $BC$ of $\triangle ABC$, with $K$ and $L$ circumcenters of $\triangle ABD$ and $\triangle ADC$, show $\triangle ABC\sim \triangle AKL$

Prove that $DE\perp EF$.

What is the value of $BC^2$ in the following diagram?

Inversion in a plane; prove $P\left(\Delta A'B'C'\right)=\left[\frac{R^2}{(|OA||OB||OC|)^{\frac{1}{3}}}\right]^4P\left(\Delta ABC\right)$

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