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15
Math.TechQA.Club
2026-03-28 12:02:24
1k
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Quadrilateral $ABCD$ with $AB=AD$, $\angle BAD=60^\circ$, $\angle BCD=120^\circ$. Prove $BC+DC=AC$
Published on
28 Mar 2026 - 12:02
#geometry
#euclidean-geometry
#triangles
#quadrilateral
50
Views
Combination of reflection symmetries in $\mathbb{E^4}$
Published on
26 Mar 2026 - 8:02
#euclidean-geometry
#rotations
#isometry
#reflection
#4-manifolds
76
Views
Is there any proof that Euclid's fifth postulate cannot be proven?
Published on
25 Mar 2026 - 14:39
#geometry
#soft-question
#euclidean-geometry
#math-history
#noneuclidean-geometry
91
Views
Geometry problem I am having trouble to solve
Published on
09 Apr 2026 - 17:11
#geometry
#euclidean-geometry
#power-of-the-point
283
Views
Calculate, in cm, the length of segment KL
Published on
16 Jun 2020 - 22:08
#geometry
#euclidean-geometry
470
Views
Find the minimum perimeter of the triangle.
Published on
03 Apr 2026 - 8:46
#geometry
#euclidean-geometry
#triangles
#maxima-minima
56
Views
Find all the parameters $\lambda\in[0,1]$ s. t. $\measuredangle BTQ=90^\circ$.
Published on
05 Apr 2026 - 22:45
#geometry
#vectors
#euclidean-geometry
#triangles
#circles
87
Views
Elementary Geometry : Structure of presentation
Published on
11 Apr 2026 - 2:37
#geometry
#euclidean-geometry
#triangles
#angle
74
Views
Finiding orientation of a rod
Published on
30 Mar 2026 - 11:58
#vectors
#euclidean-geometry
#rotations
234
Views
Intersecting triangles: Find the length of a segment given one side and two ratios
Published on
26 Mar 2026 - 2:54
#geometry
#euclidean-geometry
#triangles
#ratio
#geometric-transformation
487
Views
How to inscribe a square in an arbitrary quadrilateral using compass and straight edge
Published on
11 Apr 2026 - 16:50
#geometry
#euclidean-geometry
#plane-geometry
63
Views
Counting the number of lines
Published on
27 Mar 2026 - 12:03
#combinatorics
#geometry
#graph-theory
#euclidean-geometry
#combinatorial-proofs
145
Views
how to prove the segment $FH=HE$
Published on
11 Apr 2026 - 6:08
#geometry
#euclidean-geometry
#plane-geometry
81
Views
In $\triangle ABC$, $D$ bisects $AB$, $E$ trisects $BC$ and $\angle ADC=\angle BAE$. Find $\angle BAC$
Published on
18 Jun 2020 - 16:38
#geometry
#euclidean-geometry
493
Views
Distance from one vertex of a rectangular prism to the plane determined by three other vertices, without using vectors or calculus
Published on
19 Jun 2020 - 3:00
#geometry
#euclidean-geometry
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