Question

$ABCD$ is a quadrilateral and $P,Q$ are midpoints of $CD, AB.$...

score 401 · Answer 1 · 2017-05-19 08:20:57

401

Views

$ABCD$ is a quadrilateral and $P,Q$ are midpoints of $CD, AB.$...

Published on 19 May 2017 - 8:20

score 175 · Answer 2 · 2017-05-19 09:20:41

175

Views

In a quadrilateral $ABCD, $ it is given that $AB$ is parallel to $CD$...

Published on 19 May 2017 - 9:20

score 946 · Answer 3 · 2017-05-29 11:17:05

946

Views

Sufficient condition for quadrilateral to be cyclic

Published on 29 May 2017 - 11:17

score 54 · Answer 4 · 2017-05-30 16:34:20

54

Views

Making a Triangle from $3$ sides of a Quadrilateral

Published on 30 May 2017 - 16:34

score 1k · Answer 5 · 2017-06-09 08:20:02

1k

Views

Irregular quadrilateral

Published on 09 Jun 2017 - 8:20

score 2.1k · Answer 6 · 2026-03-29 20:34:00

2.1k

Views

What is a simple (or not) way of finding the lengths of the diagonals of this rhombus?

Published on 29 Mar 2026 - 20:34

score 94 · Answer 7 · 2017-07-03 03:56:03

94

Views

Angles and Quadrilaterals Problem 70

Published on 03 Jul 2017 - 3:56

score 320 · Answer 8 · 2017-07-09 02:56:55

320

Views

angle chasing in quadrilaterals

Published on 09 Jul 2017 - 2:56

score 5.6k · Answer 9 · 2017-07-10 15:38:09

5.6k

Views

How to find missing angles in a quadrilateral

Published on 10 Jul 2017 - 15:38

score 534 · Answer 10 · 2017-07-15 09:41:15

534

Views

A circle is inscribed in trapezoid $ABCD(BC \parallel AD)$. The circle is tangent to the sides of $AB$ and $CD$ at $K$ and $L$, respectively.

Published on 15 Jul 2017 - 9:41

score 208 · Answer 11 · 2017-07-19 19:38:41

208

Views

Prove that $\gamma = 99^{\circ}$ in this quadrilateral.

Published on 19 Jul 2017 - 19:38

score 99 · Answer 12 · 2017-07-22 15:19:36

99

Views

A synthetic proof that a figure with 4 right angles is planar

Published on 22 Jul 2017 - 15:19

score 12.5k · Answer 13 · 2017-08-03 11:41:24

12.5k

Views

If ABCD is a quadrilateral in which AB || CD and AD=BC, prove that $\angle$A=$\angle$ B.

Published on 03 Aug 2017 - 11:41

score 353 · Answer 14 · 2026-03-28 01:07:11

353

Views

Can every arbitrary set of four points in 2D space map to at least one right-angled rectangle perspective-projected from 3D space onto the plane?

Published on 28 Mar 2026 - 1:07

score 1k · Answer 15 · 2026-03-28 01:07:38

1k

Views

Relationship of aspect ratio to the homography matrices between a rectangle and an arbitrary quadrilateral

Published on 28 Mar 2026 - 1:07

List Question

$ABCD$ is a quadrilateral and $P,Q$ are midpoints of $CD, AB.$...

In a quadrilateral $ABCD, $ it is given that $AB$ is parallel to $CD$...

Sufficient condition for quadrilateral to be cyclic

Making a Triangle from $3$ sides of a Quadrilateral

Irregular quadrilateral

What is a simple (or not) way of finding the lengths of the diagonals of this rhombus?

Angles and Quadrilaterals Problem 70

angle chasing in quadrilaterals

How to find missing angles in a quadrilateral

A circle is inscribed in trapezoid $ABCD(BC \parallel AD)$. The circle is tangent to the sides of $AB$ and $CD$ at $K$ and $L$, respectively.

Prove that $\gamma = 99^{\circ}$ in this quadrilateral.

A synthetic proof that a figure with 4 right angles is planar

If ABCD is a quadrilateral in which AB || CD and AD=BC, prove that $\angle$A=$\angle$ B.

Can every arbitrary set of four points in 2D space map to at least one right-angled rectangle perspective-projected from 3D space onto the plane?

Relationship of aspect ratio to the homography matrices between a rectangle and an arbitrary quadrilateral

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