List questions from triangles

Published on 09 Apr 2026 - 21:28

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How do I find $x$ and $y$ algebraically from this isosceles triangle?

Published on 12 Apr 2026 - 2:21

44

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Prove that $AY$ is perpendicular to $BP$

Published on 15 Apr 2026 - 8:36

72

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Prove that triangles $SBX,PCY,RAQ,ABC$ have the same area

Published on 16 Apr 2026 - 5:43

72

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In $\triangle ABC$, $AB=AC$, $I$ is the incenter, and $PD^2=PE\cdot PF$. Show that $\square IPBC$ is a cyclic quadrilateral.

Published on 15 Apr 2026 - 14:57

69

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On Coordinate Geometry and the Triangular Inequality.

Published on 14 Apr 2026 - 6:01

88

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Dependency of measure of angles from length of edges in a triangle with excircle

Published on 10 Apr 2026 - 21:00

248

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SAT II Geometry Find the missing side length

Published on 13 Apr 2026 - 1:31

39

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Extremizing sum/difference of lengths using triangle inequality

Published on 09 Apr 2026 - 23:14

134

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Extremizing sum and difference of lengths using triangle inequality

Published on 10 Apr 2026 - 4:36

201

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Leg bisectors in a trapezoid and angle equality

Published on 25 Mar 2026 - 12:53

557

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A Square Inside A Triangle (but with a twist)

Published on 10 Apr 2026 - 18:14

317

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Right angle triangle and angle bisector

Published on 12 Apr 2026 - 13:31

676

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In a triangle $ABC$, if $\sin A$, $\sin B$ and $\sin C$ form an A.P, prove that $\cot (A/2)\cot(C/2) = 3$.

Published on 15 Apr 2026 - 15:52

1.9k

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Cutting a Triangle Through Its Centroid

Published on 09 Apr 2026 - 12:12

List Question

Orientation of a 3D triangle vertices

How do I find $x$ and $y$ algebraically from this isosceles triangle?

Prove that $AY$ is perpendicular to $BP$

Prove that triangles $SBX,PCY,RAQ,ABC$ have the same area

In $\triangle ABC$, $AB=AC$, $I$ is the incenter, and $PD^2=PE\cdot PF$. Show that $\square IPBC$ is a cyclic quadrilateral.

On Coordinate Geometry and the Triangular Inequality.

Dependency of measure of angles from length of edges in a triangle with excircle

SAT II Geometry Find the missing side length

Extremizing sum/difference of lengths using triangle inequality

Extremizing sum and difference of lengths using triangle inequality

Leg bisectors in a trapezoid and angle equality

A Square Inside A Triangle (but with a twist)

Right angle triangle and angle bisector

In a triangle $ABC$, if $\sin A$, $\sin B$ and $\sin C$ form an A.P, prove that $\cot (A/2)\cot(C/2) = 3$.

Cutting a Triangle Through Its Centroid

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