List questions from quadrilateral

Published on 30 Mar 2026 - 0:18

342

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Diagonals of a parallelogram

Published on 16 Aug 2020 - 0:44

199

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how to prove that the segment $IF=HF+GF$

Published on 16 Aug 2020 - 6:43

61

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A geometry problem about areas and lengths. Squares and polygons.

Published on 17 Aug 2020 - 19:53

425

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Quadrilateral inside a polygon having no common side,different approach.

Published on 22 Aug 2020 - 9:22

684

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Generalization of two formulae and an alternative proof of Bretschneider's formula

Published on 22 Aug 2020 - 15:12

379

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In quadrilateral $ABCD$, $\angle BAC=\angle CAD=2\,\angle ACD=40^\circ$ and $\angle ACB=70^\circ$. Find $\angle ADB$.

Published on 29 Aug 2020 - 9:35

81

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Prove that $MN=\frac{1}{2}(AB+BC+CA)$

Published on 02 Sep 2020 - 17:50

284

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Show this quad is cyclic

Published on 06 Sep 2020 - 19:14

46

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If $AB = a$, $BC = b$, $CD = c$, $DA = d$ of convex quad, determine the length of the segment $PQ$ from incircles

Published on 12 Sep 2020 - 2:41

368

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$a,b,c,d$ are complex numbers corresponding to points $A,B,C,D$ lying on a circle with origin as center,and chord $AB⟂CD$. Find $ab+cd$

Published on 12 Sep 2020 - 7:05

74

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Problem involving three cyclic quadrilaterals

Published on 14 Sep 2020 - 15:03

108

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Area of irregular quadrilateral with diagonals proof

Published on 16 Sep 2020 - 19:53

28

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Express 2 vectors in terms of 2 other vectors.

Published on 19 Sep 2020 - 10:47

195

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Area of Triangle inside a Rectangle

Published on 28 Mar 2026 - 6:06

List Question

Inscribed Circles in a Quadrilateral

Diagonals of a parallelogram

how to prove that the segment $IF=HF+GF$

A geometry problem about areas and lengths. Squares and polygons.

Quadrilateral inside a polygon having no common side,different approach.

Generalization of two formulae and an alternative proof of Bretschneider's formula

In quadrilateral $ABCD$, $\angle BAC=\angle CAD=2\,\angle ACD=40^\circ$ and $\angle ACB=70^\circ$. Find $\angle ADB$.

Prove that $MN=\frac{1}{2}(AB+BC+CA)$

Show this quad is cyclic

If $AB = a$, $BC = b$, $CD = c$, $DA = d$ of convex quad, determine the length of the segment $PQ$ from incircles

$a,b,c,d$ are complex numbers corresponding to points $A,B,C,D$ lying on a circle with origin as center,and chord $AB⟂CD$. Find $ab+cd$

Problem involving three cyclic quadrilaterals

Area of irregular quadrilateral with diagonals proof

Express 2 vectors in terms of 2 other vectors.

Area of Triangle inside a Rectangle

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