List questions from geometric-transformation

Published on 25 Mar 2026 - 15:58

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Two equal segments, two known angles, find angle in triangle

Published on 25 Mar 2026 - 17:31

663

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"Given three parallel straight lines. Construct a square three of whose vertices belong to these lines." Are all three lines required?

Published on 25 Mar 2026 - 16:01

3.4k

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Brocard's theorem - $O$ is orthocenter of $\Delta EFI$

Published on 25 Mar 2026 - 16:03

3.8k

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Stuck on a Geometry Problem

Published on 01 Apr 2026 - 5:55

340

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Line containing centers of circles formed by intersection points of 3 circles passes through the radical center of the three circles

Published on 25 Mar 2026 - 17:42

174

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Compute $m ( \angle ACD $).

Published on 10 May 2026 - 14:35

248

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Circle problem in which i wanted to find value of $PQ$

Published on 25 Mar 2026 - 16:01

50

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Edges of rectangle mapped to a new plane

Published on 25 Mar 2026 - 15:47

158

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Prove that $BC$, $B_1C_1$, $B_2C_2$ are concurrent.

Published on 25 Mar 2026 - 17:45

76

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Prove of a theorem of a geometrical place

Published on 29 Apr 2026 - 12:52

133

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Euclid Geometry: Seeking for a simpler geometric solution

Published on 25 Mar 2026 - 17:29

53

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Proof that the triangle formed by mass centers is equilateral.

Published on 03 May 2026 - 12:20

89

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Let $O$ and $O'$ be two circles intersecting at two points, $A$ and $B$. Construct a line segment going through $A$ bisected by the two circles

Published on 25 Mar 2026 - 19:04

279

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Finding angle with pure Geometry.

Published on 01 Apr 2026 - 0:18

List Question

EGMO Problem 3.20 (BAMO 2013/3)

Two equal segments, two known angles, find angle in triangle

"Given three parallel straight lines. Construct a square three of whose vertices belong to these lines." Are all three lines required?

Brocard's theorem - $O$ is orthocenter of $\Delta EFI$

Stuck on a Geometry Problem

Line containing centers of circles formed by intersection points of 3 circles passes through the radical center of the three circles

Compute $m ( \angle ACD $).

Circle problem in which i wanted to find value of $PQ$

Edges of rectangle mapped to a new plane

Prove that $BC$, $B_1C_1$, $B_2C_2$ are concurrent.

Prove of a theorem of a geometrical place

Euclid Geometry: Seeking for a simpler geometric solution

Proof that the triangle formed by mass centers is equilateral.

Let $O$ and $O'$ be two circles intersecting at two points, $A$ and $B$. Construct a line segment going through $A$ bisected by the two circles

Finding angle with pure Geometry.

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