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Finding the length of the altitude of a triangle

score 6.1k · Answer 1 · 2016-09-11 15:44:06

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Finding the length of the altitude of a triangle

Published on 11 Sep 2016 - 15:44

score 384 · Answer 2 · 2026-03-27 13:42:09

384

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What does the solution of a set of three linear equations in three variables looks like when the planes form the shape of triangular prism in $R^3$?

Published on 27 Mar 2026 - 13:42

score 2.2k · Answer 3 · 2016-09-12 20:19:51

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Understanding intuitively Why the rate of change of area of a circle with radius is the circumference of the circle

Published on 12 Sep 2016 - 20:19

score 1.1k · Answer 4 · 2016-09-13 00:57:10

1.1k

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Does this formula $\cos\theta=\frac{(u|v)}{|u||v|}$ work for a general inner product?

Published on 13 Sep 2016 - 0:57

score 77 · Answer 5 · 2016-09-13 09:32:55

Find the equation of the plane that has distance $1$ from line $X: (1,0,2) + \lambda (1,0,2)$ and contains points $P=(1,1,-1)$ and $Q = (2,1,1)$

score 3.1k · Answer 6 · 2026-03-29 16:56:06

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verify that a triangle contains a right-angle

Published on 29 Mar 2026 - 16:56

score 684 · Answer 7 · 2026-03-27 15:13:24

684

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Show that the plane $3x-2y-z=0$ cuts the cones $21x^2-4y^2-5z^2=0$ and $3yz-2zx+2xy=0$ in the same pair of perpendicular lines.

Published on 27 Mar 2026 - 15:13

score 794 · Answer 8 · 2016-09-13 17:50:42

794

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equation for cube?

Published on 13 Sep 2016 - 17:50

score 158 · Answer 9 · 2016-09-13 23:08:53

158

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Finding the two planes which contains a given line and forms an angle of $60^\circ$ with a given plane

Published on 13 Sep 2016 - 23:08

score 474 · Answer 10 · 2016-09-14 09:23:02

474

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Isometric map in an open set of Euclidean space

Published on 14 Sep 2016 - 9:23

score 476 · Answer 11 · 2016-09-15 13:17:41

476

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If $ax^2+2hxy+by^2=0$ be the two sides of a $||$gm ..

Published on 15 Sep 2016 - 13:17

score 144 · Answer 12 · 2016-09-15 23:02:51

144

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Old Putnam problem that I could use some help on

Published on 15 Sep 2016 - 23:02

score 58 · Answer 13 · 2016-09-16 15:00:51

58

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Finding the two planes that contain a given line and form the same angle with two other lines

Published on 16 Sep 2016 - 15:00

score 63 · Answer 14 · 2016-09-17 05:39:02

63

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Find the equations of the tangents from..

Published on 17 Sep 2016 - 5:39

score 112 · Answer 15 · 2026-04-02 21:54:07

112

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What are the differences of the two polar equation of two conics $\frac{l}{r}=1+e\cos{\theta}$ and $\frac{l}{r}=1-e\cos{\theta}$

Published on 02 Apr 2026 - 21:54

List Question

Finding the length of the altitude of a triangle

What does the solution of a set of three linear equations in three variables looks like when the planes form the shape of triangular prism in $R^3$?

Understanding intuitively Why the rate of change of area of a circle with radius is the circumference of the circle

Does this formula $\cos\theta=\frac{(u|v)}{|u||v|}$ work for a general inner product?

Find the equation of the plane that has distance $1$ from line $X: (1,0,2) + \lambda (1,0,2)$ and contains points $P=(1,1,-1)$ and $Q = (2,1,1)$

verify that a triangle contains a right-angle

Show that the plane $3x-2y-z=0$ cuts the cones $21x^2-4y^2-5z^2=0$ and $3yz-2zx+2xy=0$ in the same pair of perpendicular lines.

equation for cube?

Finding the two planes which contains a given line and forms an angle of $60^\circ$ with a given plane

Isometric map in an open set of Euclidean space

If $ax^2+2hxy+by^2=0$ be the two sides of a $||$gm ..

Old Putnam problem that I could use some help on

Finding the two planes that contain a given line and form the same angle with two other lines

Find the equations of the tangents from..

What are the differences of the two polar equation of two conics $\frac{l}{r}=1+e\cos{\theta}$ and $\frac{l}{r}=1-e\cos{\theta}$

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