List questions from euclidean-geometry

Published on 09 Apr 2026 - 5:33

588

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A circle is divided into $5$ parts as shown in the diagram and parts are colored either red or green. Find which area is bigger.

Published on 27 Jul 2020 - 6:55

104

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Circumcircle intersecting circumcircle

Published on 11 Apr 2026 - 17:58

73

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If $f \circ f$ is affine then so is $f$?

Published on 27 Mar 2026 - 2:07

197

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Prove that $\angle A B C+\angle B C A+\angle C A B=0$ using directed angles

Published on 28 Jul 2020 - 10:00

333

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self polar triangle with respect to a circle

Published on 12 Apr 2026 - 15:17

197

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How to find the angle of a force applied to a point in the interior of a disk so that is at equilibrium?

Published on 28 Mar 2026 - 15:46

76

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If $f \circ f$ is affine and $f$ is area-preserving, must $f$ be affine?

Published on 27 Mar 2026 - 2:03

84

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Find the angle θ (all the circles are tangent)

Published on 27 Mar 2026 - 19:53

250

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Subgroup of Plane Isometries Isomorphic to $O_2(\mathbb{R})$

Published on 12 Apr 2026 - 10:08

212

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Proof with euclidean geometry (tangents lines)

Published on 10 Apr 2026 - 14:36

33

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Mass point ratio involving median to hypotenuse

Published on 11 Apr 2026 - 11:18

163

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A circle rolling along the base of an isosceles triangle has constant arc length cut out by the lateral sides.

Published on 28 Jul 2020 - 23:12

303

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Prove Sylvester Gallai Theorem using combinatorics

Published on 11 Apr 2026 - 8:22

137

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Missing angle problem

Published on 08 Apr 2026 - 16:12

List Question

Dissecting a triangle into $n$-gons

A circle is divided into $5$ parts as shown in the diagram and parts are colored either red or green. Find which area is bigger.

Circumcircle intersecting circumcircle

If $f \circ f$ is affine then so is $f$?

Prove that $\angle A B C+\angle B C A+\angle C A B=0$ using directed angles

self polar triangle with respect to a circle

How to find the angle of a force applied to a point in the interior of a disk so that is at equilibrium?

If $f \circ f$ is affine and $f$ is area-preserving, must $f$ be affine?

Find the angle θ (all the circles are tangent)

Subgroup of Plane Isometries Isomorphic to $O_2(\mathbb{R})$

Proof with euclidean geometry (tangents lines)

Mass point ratio involving median to hypotenuse

A circle rolling along the base of an isosceles triangle has constant arc length cut out by the lateral sides.

Prove Sylvester Gallai Theorem using combinatorics

Missing angle problem

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