List questions from euclidean-geometry

Published on 03 Apr 2026 - 12:17

37

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Interpreting two lines in 3-space

Published on 04 Jan 2020 - 12:28

91

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Prove that for all acute triangles $\triangle ABC$, $r_a + r_b + r_c \ge m_a + m_b + m_c$.

Published on 25 Mar 2026 - 11:06

509

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Haversine Formula prove inequality triangle

Published on 25 Mar 2026 - 11:00

240

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$ABCD$ is a trapezium, $MN=\dfrac{AB-CD}{2}$ where $M,N$ are the midpoints of $AB,CD$, respectively; show $\angle BAD+\angle ABC=90^\circ$

Published on 25 Mar 2026 - 21:54

54

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Isosceles trapezoid circunference

Published on 31 Mar 2026 - 13:05

884

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Solving $\tan x= \tan 2x\tan3x\tan4x$ and a related geometric problem

Published on 03 Apr 2026 - 12:11

51

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If $M\in BC$ of $\triangle ABC$, and $2\cot \angle AMC =\cot B-\cot C$, then $AM$ is a median

Published on 03 Apr 2026 - 12:13

188

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Frieze group p2mg

Published on 28 Mar 2026 - 12:45

481

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Is a convex cone which is generated by a closed linear cone always closed?

Published on 12 Mar 2026 - 21:34

96

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Construction ruler and compass [logic]

Published on 08 Jan 2020 - 21:40

43

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Checking the answer : Distance from a line to a plane.

Published on 29 Mar 2026 - 20:04

170

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Prove that $\angle AQP = \angle ABC$

Published on 09 Jan 2020 - 10:01

40

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Bisected median

Published on 31 Mar 2026 - 18:20

374

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Definition and properties of "Euclidean variable" in the context of pattern recognition

Published on 26 Mar 2026 - 1:10

List Question

evaluate the side of a triangle?

Interpreting two lines in 3-space

Prove that for all acute triangles $\triangle ABC$, $r_a + r_b + r_c \ge m_a + m_b + m_c$.

Haversine Formula prove inequality triangle

$ABCD$ is a trapezium, $MN=\dfrac{AB-CD}{2}$ where $M,N$ are the midpoints of $AB,CD$, respectively; show $\angle BAD+\angle ABC=90^\circ$

Isosceles trapezoid circunference

Solving $\tan x= \tan 2x\tan3x\tan4x$ and a related geometric problem

If $M\in BC$ of $\triangle ABC$, and $2\cot \angle AMC =\cot B-\cot C$, then $AM$ is a median

Frieze group p2mg

Is a convex cone which is generated by a closed linear cone always closed?

Construction ruler and compass [logic]

Checking the answer : Distance from a line to a plane.

Prove that $\angle AQP = \angle ABC$

Bisected median

Definition and properties of "Euclidean variable" in the context of pattern recognition

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