Question

Other way to show $ Q, H, M $ are collinear without $BECH$ is a parallelogram (IMO 2015 Problem 3 )

score 128 · Answer 1 · 2026-04-15 13:26:45

128

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Other way to show $ Q, H, M $ are collinear without $BECH$ is a parallelogram (IMO 2015 Problem 3 )

Published on 15 Apr 2026 - 13:26

score 3.9k · Answer 2 · 2026-04-16 18:24:18

3.9k

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If AC and BC are two equal chords, BA is produced to P and CP cuts the circle at T the how is CT:CB=CA:CP?

Published on 16 Apr 2026 - 18:24

score 2.6k · Answer 3 · 2026-04-15 00:13:36

2.6k

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3D line in a 3D plane. Find the intersection of the two.

Published on 15 Apr 2026 - 0:13

score 100 · Answer 4 · 2026-04-15 14:03:03

100

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Distance involving 3D lines and vectors.

Published on 15 Apr 2026 - 14:03

score 533 · Answer 5 · 2026-04-16 10:07:50

533

Views

Could Euclid have proven that real number multiplication is commutative?

Published on 16 Apr 2026 - 10:07

score 230 · Answer 6 · 2026-04-15 00:45:19

230

Views

Find value of $t$ between the difference of 3D vectors.

Published on 15 Apr 2026 - 0:45

score 900 · Answer 7 · 2026-04-13 00:51:34

900

Views

Could Euclid have proven that multiplication of real numbers distributes over addition?

Published on 13 Apr 2026 - 0:51

score 32 · Answer 8 · 2026-04-07 20:05:51

32

Views

How can I show that symmetry groups of two regular n-gons are conjugate?

Published on 07 Apr 2026 - 20:05

score 75 · Answer 9 · 2026-04-14 21:19:46

75

Views

Set of discrete orbits under subgroup of $Isom(\mathbb{E}^n)$ is clopen

Published on 14 Apr 2026 - 21:19

score 737 · Answer 10 · 2026-04-15 10:18:36

737

Views

Constructing a parallelogram according to the given condition

Published on 15 Apr 2026 - 10:18

score 223 · Answer 11 · 2026-04-15 05:30:50

223

Views

Countably Infinitely Many Points in a Euclidean Space with Restraining Orders

Published on 15 Apr 2026 - 5:30

score 59 · Answer 12 · 2026-04-15 13:56:23

59

Views

Two circles covering the sides of a triangle

Published on 15 Apr 2026 - 13:56

score 301 · Answer 13 · 2026-04-09 20:03:59

301

Views

Easy Compass Construction Problem

Published on 09 Apr 2026 - 20:03

score 65 · Answer 14 · 2026-04-18 18:02:04

65

Views

What can be said about triangle with certain condition?

Published on 18 Apr 2026 - 18:02

score 359 · Answer 15 · 2026-04-15 17:26:36

359

Views

When to use which condition number? (which norm)?

Published on 15 Apr 2026 - 17:26

List Question

Other way to show $ Q, H, M $ are collinear without $BECH$ is a parallelogram (IMO 2015 Problem 3 )

If AC and BC are two equal chords, BA is produced to P and CP cuts the circle at T the how is CT:CB=CA:CP?

3D line in a 3D plane. Find the intersection of the two.

Distance involving 3D lines and vectors.

Could Euclid have proven that real number multiplication is commutative?

Find value of $t$ between the difference of 3D vectors.

Could Euclid have proven that multiplication of real numbers distributes over addition?

How can I show that symmetry groups of two regular n-gons are conjugate?

Set of discrete orbits under subgroup of $Isom(\mathbb{E}^n)$ is clopen

Constructing a parallelogram according to the given condition

Countably Infinitely Many Points in a Euclidean Space with Restraining Orders

Two circles covering the sides of a triangle

Easy Compass Construction Problem

What can be said about triangle with certain condition?

When to use which condition number? (which norm)?

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