Question

Angles of a Quadrilateral

score 52 · Answer 1 · 2022-05-16 08:39:14

52

Views

Angles of a Quadrilateral

Published on 16 May 2022 - 8:39

score 70 · Answer 2 · 2022-05-22 17:01:54

70

Views

Area of a special triangle in a quadrilateral

Published on 22 May 2022 - 17:01

score 71 · Answer 3 · 2022-05-24 19:57:30

71

Views

Given Circle $E$ inscribed in square $ABCD,$ prove that its radius is equal to half the length of the square's side length.

Published on 24 May 2022 - 19:57

score 72 · Answer 4 · 2022-05-26 17:55:06

72

Views

Are the only quadrilaterals satisfying this symmetric relation rectangles?

Published on 26 May 2022 - 17:55

score 76 · Answer 5 · 2022-05-30 05:04:20

76

Views

Angle chasing proof

Published on 30 May 2022 - 5:04

score 260 · Answer 6 · 2022-06-08 10:13:19

260

Views

Balkan MO 2018 Problem 1 about a complete cyclic quadrilateral

Published on 08 Jun 2022 - 10:13

score 92 · Answer 7 · 2022-06-28 01:50:37

92

Views

Determine Scalene Trapezoid with three sides and an angle adjacent to unknown side

Published on 28 Jun 2022 - 1:50

score 94 · Answer 8 · 2022-06-28 15:31:57

94

Views

How can I prove that two lines intersect at a circle?---an extended observation.

Published on 28 Jun 2022 - 15:31

score 236 · Answer 9 · 2022-07-01 12:47:32

236

Views

Find another method of solving the shaded area.

Published on 01 Jul 2022 - 12:47

score 45 · Answer 10 · 2022-07-05 15:33:39

45

Views

bending a triangle made out of 5 segments into a quadrilateral

Published on 05 Jul 2022 - 15:33

score 214 · Answer 11 · 2022-07-06 08:13:10

214

Views

Four points A, B, C and D lie on a circle, respectively, knowing that AB = CD, prove that ABCD is an isosceles trapezoid.

Published on 06 Jul 2022 - 8:13

score 50 · Answer 12 · 2022-07-18 05:03:13

50

Views

Does the $A=bh$ formula still work even for this kind of parallelogram?

Published on 18 Jul 2022 - 5:03

score 61 · Answer 13 · 2022-07-19 09:31:45

61

Views

Is the total number of these figures a quartic polynomial with respect to $n$ ？

Published on 19 Jul 2022 - 9:31

score 179 · Answer 14 · 2022-07-29 05:02:01

179

Views

Convex quadrilateral inscribed in a circle

Published on 29 Jul 2022 - 5:02

score 78 · Answer 15 · 2022-08-03 14:31:50

78

Views

How to find the maximum area of a quadrilateral, when three of the sides add up to 24?

Published on 03 Aug 2022 - 14:31

List Question

Angles of a Quadrilateral

Area of a special triangle in a quadrilateral

Given Circle $E$ inscribed in square $ABCD,$ prove that its radius is equal to half the length of the square's side length.

Are the only quadrilaterals satisfying this symmetric relation rectangles?

Angle chasing proof

Balkan MO 2018 Problem 1 about a complete cyclic quadrilateral

Determine Scalene Trapezoid with three sides and an angle adjacent to unknown side

How can I prove that two lines intersect at a circle?---an extended observation.

Find another method of solving the shaded area.

bending a triangle made out of 5 segments into a quadrilateral

Four points A, B, C and D lie on a circle, respectively, knowing that AB = CD, prove that ABCD is an isosceles trapezoid.

Does the $A=bh$ formula still work even for this kind of parallelogram?

Is the total number of these figures a quartic polynomial with respect to $n$ ？

Convex quadrilateral inscribed in a circle

How to find the maximum area of a quadrilateral, when three of the sides add up to 24?

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