List questions from quadrilateral

Published on 18 Jun 2018 - 19:25

208

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prove that $PM$ is perpendicular to $AB$ on a cyclic quadrilateral

Published on 21 Jun 2018 - 16:21

77

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Find the maximal area of a quadrilateral inside of a rectangle

Published on 21 Jun 2018 - 20:14

56

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O lies in the Gauss line

Published on 22 Mar 2026 - 0:05

440

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All relationships between angles formed by drawing diagonals of a quadrilateral

Published on 06 Jul 2018 - 22:29

67

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Making a quadrilateral cyclic by an homothety

Published on 13 Mar 2026 - 21:03

809

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Finding an Angle using Cyclic Quadrilateral and Circle Theorems

Published on 20 Jul 2018 - 7:16

67

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inequality proving for intersection

Published on 22 Mar 2026 - 1:03

153

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Tangential quadrilaterals description

Published on 22 Mar 2026 - 6:52

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A conjecture involving prime numbers and parallelograms

Published on 20 Aug 2018 - 8:08

532

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The hunting of "missing primes"

Published on 21 Mar 2026 - 23:12

622

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Can you find $2$ sides of a quadrilateral with $2$ sides and all $4$ angles?

Published on 21 Aug 2018 - 0:43

559

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cyclic quadrilateral inside an isosceles right triangle

Published on 27 Aug 2018 - 8:08

182

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Given two trapezoids of equal area, show that the length of FB is (a^2 + b^2) / 2

Published on 04 Sep 2018 - 20:28

91

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Prove the identity in inner product space

Published on 22 Mar 2026 - 8:10

List Question

How to find equidistant coordinates of an inner quadrilateral?

prove that $PM$ is perpendicular to $AB$ on a cyclic quadrilateral

Find the maximal area of a quadrilateral inside of a rectangle

O lies in the Gauss line

All relationships between angles formed by drawing diagonals of a quadrilateral

Making a quadrilateral cyclic by an homothety

Finding an Angle using Cyclic Quadrilateral and Circle Theorems

inequality proving for intersection

Tangential quadrilaterals description

A conjecture involving prime numbers and parallelograms

The hunting of "missing primes"

Can you find $2$ sides of a quadrilateral with $2$ sides and all $4$ angles?

cyclic quadrilateral inside an isosceles right triangle

Given two trapezoids of equal area, show that the length of FB is (a^2 + b^2) / 2

Prove the identity in inner product space

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