Question

How show this $\overrightarrow {AC}\cdot\overrightarrow {BD}=\frac{1}{2}[(b^2+d^2)-(a^2+c^2)]$

score 82 · Answer 1 · 2015-10-21 12:27:28

82

Views

How show this $\overrightarrow {AC}\cdot\overrightarrow {BD}=\frac{1}{2}[(b^2+d^2)-(a^2+c^2)]$

Published on 21 Oct 2015 - 12:27

score 660 · Answer 2 · 2026-03-29 11:24:55

660

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Is a shape formed of two tangents and radii symmetrical?

Published on 29 Mar 2026 - 11:24

score 96 · Answer 3 · 2026-03-27 12:04:12

96

Views

Is this Quadrilateral possible?

Published on 27 Mar 2026 - 12:04

score 11.1k · Answer 4 · 2015-11-28 16:01:37

11.1k

Views

The midpoint of one diagonal in a parallelogram is also the midpoint of another

Published on 28 Nov 2015 - 16:01

score 511 · Answer 5 · 2015-12-07 17:14:03

511

Views

A quadrilateral's side midpoints form a square. Area = 50. What's the size of the other two sides of the quadrilateral?

Published on 07 Dec 2015 - 17:14

score 1.7k · Answer 6 · 2015-12-11 18:40:08

1.7k

Views

Calculate Interior angles of irregular polygon with side measurement as $900, 1165, 1093$ and $1457$

Published on 11 Dec 2015 - 18:40

score 474 · Answer 7 · 2015-12-13 13:43:46

474

Views

Prove the triangle is equilateral given that a quadrilateral related to its circumcircle is a kite

Published on 13 Dec 2015 - 13:43

score 326 · Answer 8 · 2016-01-12 05:22:40

326

Views

Common meeting point for 3 points to reach 4th point

Published on 12 Jan 2016 - 5:22

score 1.7k · Answer 9 · 2026-03-09 05:52:34

1.7k

Views

Finding angles of a quadrilateral

Published on 09 Mar 2026 - 5:52

score 349 · Answer 10 · 2026-02-27 22:23:52

349

Views

How to find the corners of a shape given 4 inequalities?

Published on 27 Feb 2026 - 22:23

score 1.4k · Answer 11 · 2016-01-16 08:39:59

1.4k

Views

angles in rhombus when an equilateral triangle is inscribed in it

Published on 16 Jan 2016 - 8:39

score 212 · Answer 12 · 2016-01-18 18:59:14

212

Views

Prove that $AC^2 + BD^2+ 4PQ^2 = AB^2 +BC^2+ CA^2+DA^2$

Published on 18 Jan 2016 - 18:59

score 105 · Answer 13 · 2016-01-25 15:50:11

105

Views

$3$ Triangles and a quadrilateral

Published on 25 Jan 2016 - 15:50

score 6k · Answer 14 · 2016-01-27 22:04:54

6k

Views

A Quadrilateral's area given four sides and a diagonal

Published on 27 Jan 2016 - 22:04

score 5.2k · Answer 15 · 2026-03-28 21:51:45

5.2k

Views

Ways to create a quadrilateral by joining vertices of regular polygon with no common side to polygon

Published on 28 Mar 2026 - 21:51

List Question

How show this $\overrightarrow {AC}\cdot\overrightarrow {BD}=\frac{1}{2}[(b^2+d^2)-(a^2+c^2)]$

Is a shape formed of two tangents and radii symmetrical?

Is this Quadrilateral possible?

The midpoint of one diagonal in a parallelogram is also the midpoint of another

A quadrilateral's side midpoints form a square. Area = 50. What's the size of the other two sides of the quadrilateral?

Calculate Interior angles of irregular polygon with side measurement as $900, 1165, 1093$ and $1457$

Prove the triangle is equilateral given that a quadrilateral related to its circumcircle is a kite

Common meeting point for 3 points to reach 4th point

Finding angles of a quadrilateral

How to find the corners of a shape given 4 inequalities?

angles in rhombus when an equilateral triangle is inscribed in it

Prove that $AC^2 + BD^2+ 4PQ^2 = AB^2 +BC^2+ CA^2+DA^2$

$3$ Triangles and a quadrilateral

A Quadrilateral's area given four sides and a diagonal

Ways to create a quadrilateral by joining vertices of regular polygon with no common side to polygon

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