Question

Find $\cos2B+\cos2C$ in a triangle

score 78 · Answer 1 · 2026-03-25 06:51:37

78

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Find $\cos2B+\cos2C$ in a triangle

Published on 25 Mar 2026 - 6:51

score 31 · Answer 2 · 2026-04-07 21:15:27

31

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$(a,b)$ with $a, b \gt 0$ on $f(x)=4-x^2$ so that the area of the triangle limited by X- , Y-axis, tangent on $f(x$) at $(a,b)$ is minimal?

Published on 07 Apr 2026 - 21:15

score 1.1k · Answer 3 · 2026-04-11 13:56:56

1.1k

Views

Creating a 3D ellipsoid from a 2D ellipse (rotated around a symmetric axis)

Published on 11 Apr 2026 - 13:56

score 1k · Answer 4 · 2026-04-08 23:12:02

1k

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Seeking a counterexample or proof to claim: "all regular polygons that can divided into triangles via straight lines can tile"

Published on 08 Apr 2026 - 23:12

score 95 · Answer 5 · 2026-04-12 17:22:06

95

Views

How to determine the length of a section of a base of a cone?

Published on 12 Apr 2026 - 17:22

score 36 · Answer 6 · 2026-03-26 22:58:21

36

Views

The radius of a circle passing through a circle and the centre point of another smaller circle

Published on 26 Mar 2026 - 22:58

score 657 · Answer 7 · 2026-04-11 23:48:00

657

Views

How to determine if a ray intersects a wedge in 2d space

Published on 11 Apr 2026 - 23:48

score 126 · Answer 8 · 2026-04-12 09:20:41

126

Views

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Published on 12 Apr 2026 - 9:20

score 84 · Answer 9 · 2026-04-09 16:28:07

84

Views

How can I find the height of $ABCD?$

Published on 09 Apr 2026 - 16:28

score 74 · Answer 10 · 2026-04-13 08:22:00

Help with proving that a circle containing two complex numbers, $w=x+iy$ and $1/(\bar{w})$ must intersect ${|z|=1}$ at right angles?

score 172 · Answer 11 · 2026-03-25 06:58:56

172

Views

If $\bar{AD}=r\bar{AB}$ and $\bar{AE}=r\bar{AC}$, is $\bar{DE}\parallel\bar{BC}$?

Published on 25 Mar 2026 - 6:58

score 290 · Answer 12 · 2026-04-09 08:20:39

290

Views

An inequality in triangle geometry involving triangle OIH

Published on 09 Apr 2026 - 8:20

score 171 · Answer 13 · 2026-04-09 00:53:07

171

Views

Pythagorean theorem painting

Published on 09 Apr 2026 - 0:53

score 248 · Answer 14 · 2026-04-12 18:42:46

248

Views

Angles of a rhombus given side and height

Published on 12 Apr 2026 - 18:42

score 712 · Answer 15 · 2026-04-13 08:40:00

712

Views

How is a parabola related to a circle?

Published on 13 Apr 2026 - 8:40

List Question

Find $\cos2B+\cos2C$ in a triangle

$(a,b)$ with $a, b \gt 0$ on $f(x)=4-x^2$ so that the area of the triangle limited by X- , Y-axis, tangent on $f(x$) at $(a,b)$ is minimal?

Creating a 3D ellipsoid from a 2D ellipse (rotated around a symmetric axis)

Seeking a counterexample or proof to claim: "all regular polygons that can divided into triangles via straight lines can tile"

How to determine the length of a section of a base of a cone?

The radius of a circle passing through a circle and the centre point of another smaller circle

How to determine if a ray intersects a wedge in 2d space

General circle identity proof

How can I find the height of $ABCD?$

Help with proving that a circle containing two complex numbers, $w=x+iy$ and $1/(\bar{w})$ must intersect ${|z|=1}$ at right angles?

If $\bar{AD}=r\bar{AB}$ and $\bar{AE}=r\bar{AC}$, is $\bar{DE}\parallel\bar{BC}$?

An inequality in triangle geometry involving triangle OIH

Pythagorean theorem painting

Angles of a rhombus given side and height

How is a parabola related to a circle?

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