Question

Definition of a right angle

score 475 · Answer 1 · 2020-04-13 12:13:47

475

Views

Definition of a right angle

Published on 13 Apr 2020 - 12:13

score 53 · Answer 2 · 2020-04-13 14:12:25

53

Views

Euclidean-geometry that came in board exams.How to solve this.

Published on 13 Apr 2020 - 14:12

score 95 · Answer 3 · 2026-02-23 15:18:50

95

Views

What motivated people like Euclid to create such a general axiomatic systems like the one in the book Elements so early in history?

Published on 23 Feb 2026 - 15:18

score 65 · Answer 4 · 2020-04-13 19:06:35

65

Views

Is it necessarily true that the circumcircle of $\Delta BDC$ has $A$ as its centre?

Published on 13 Apr 2020 - 19:06

score 130 · Answer 5 · 2020-04-13 19:25:36

130

Views

Given $2x+y=180$ is true for a triangle, which quantity is bigger out of 4 choices?

Published on 13 Apr 2020 - 19:25

score 114 · Answer 6 · 2026-03-28 08:31:06

114

Views

Finding the side of a triangle made from extending a diagonal

Published on 28 Mar 2026 - 8:31

score 102 · Answer 7 · 2026-04-04 12:38:42

102

Views

Concurrency of lines made with end points of concurrent lines of a triangle made by end point of concurrent lines and points of given triangle.

Published on 04 Apr 2026 - 12:38

score 194 · Answer 8 · 2026-04-08 21:40:28

194

Views

A problem about orthocenter and circumscribed circle

Published on 08 Apr 2026 - 21:40

score 298 · Answer 9 · 2026-04-01 05:38:19

298

Views

USAMO 2011 problem #5

Published on 01 Apr 2026 - 5:38

score 276 · Answer 10 · 2026-03-28 15:56:08

276

Views

How can I prove that $MN$ is parallel to $AC$?

Published on 28 Mar 2026 - 15:56

score 80 · Answer 11 · 2026-02-23 00:51:19

80

Views

Two circles intersect at $C$, and their common tangents meet at $T$. Show $CT$ bisects the angle made by the two tangents at $C$

Published on 23 Feb 2026 - 0:51

score 137 · Answer 12 · 2026-03-28 15:56:08

137

Views

Intersections of Six Circles: Concurrence and Concyclicity

Published on 28 Mar 2026 - 15:56

score 89 · Answer 13 · 2026-04-04 12:36:33

89

Views

Clarity understanding what this question on the BMO means.

Published on 04 Apr 2026 - 12:36

score 242 · Answer 14 · 2026-04-04 12:37:49

242

Views

Lines formed mid point of sides and cevians from opposite point are concurrent

Published on 04 Apr 2026 - 12:37

score 52 · Answer 15 · 2020-04-15 12:33:12

52

Views

How is DA equal to 1/x.

Published on 15 Apr 2020 - 12:33

List Question

Definition of a right angle

Euclidean-geometry that came in board exams.How to solve this.

What motivated people like Euclid to create such a general axiomatic systems like the one in the book Elements so early in history?

Is it necessarily true that the circumcircle of $\Delta BDC$ has $A$ as its centre?

Given $2x+y=180$ is true for a triangle, which quantity is bigger out of 4 choices?

Finding the side of a triangle made from extending a diagonal

Concurrency of lines made with end points of concurrent lines of a triangle made by end point of concurrent lines and points of given triangle.

A problem about orthocenter and circumscribed circle

USAMO 2011 problem #5

How can I prove that $MN$ is parallel to $AC$?

Two circles intersect at $C$, and their common tangents meet at $T$. Show $CT$ bisects the angle made by the two tangents at $C$

Intersections of Six Circles: Concurrence and Concyclicity

Clarity understanding what this question on the BMO means.

Lines formed mid point of sides and cevians from opposite point are concurrent

How is DA equal to 1/x.

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