List questions from euclidean-geometry

Published on 12 Apr 2026 - 8:29

105

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Unknown internal angles of a quadrilateral where its area and side lengths are known

Published on 14 Apr 2026 - 2:29

185

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Area of Plane Figures

Published on 15 Apr 2026 - 15:40

269

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Points closest to the center of the cube

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621

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Ellipse problem: why are those two angles equal?

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94

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Equilateral triangle tilted between two

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490

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Prove that $ I_1, I_2, I_3, I_4 $ are concyclic

Published on 16 Apr 2026 - 1:22

789

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Finding the Gaussian curvature (line of curvature)

Published on 14 Apr 2026 - 13:49

90

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Bisection of a triangle

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1.3k

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How to prove that the line joinning the midpoints of the diagonals of trapezium is parallel to the parallel sides of the trapezium?

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833

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"Apollonius theorem": how do I prove it?

Published on 12 Apr 2026 - 16:02

184

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Symmetry in euclidean geometry

Published on 11 Apr 2026 - 23:00

653

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Find the perimeter of the following shape

Published on 15 Apr 2026 - 14:59

188

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Euclidean geometry: Given two tangents $PM$, $PN$ to a circle with center $O$, find the value $QX\cdot RY$

Published on 13 Apr 2026 - 3:06

3k

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Given a quadrilateral, prove it is a square.

Published on 16 Apr 2026 - 11:16

List Question

Do four noncoplanar points determine space?

Unknown internal angles of a quadrilateral where its area and side lengths are known

Area of Plane Figures

Points closest to the center of the cube

Ellipse problem: why are those two angles equal?

Equilateral triangle tilted between two

Prove that $ I_1, I_2, I_3, I_4 $ are concyclic

Finding the Gaussian curvature (line of curvature)

Bisection of a triangle

How to prove that the line joinning the midpoints of the diagonals of trapezium is parallel to the parallel sides of the trapezium?

"Apollonius theorem": how do I prove it?

Symmetry in euclidean geometry

Find the perimeter of the following shape

Euclidean geometry: Given two tangents $PM$, $PN$ to a circle with center $O$, find the value $QX\cdot RY$

Given a quadrilateral, prove it is a square.

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