Question

How do I know the length of a perpendicular drawn from a vertex of a triangle to the opposite arm?

score 123 · Answer 1 · 2020-02-20 15:05:43

123

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How do I know the length of a perpendicular drawn from a vertex of a triangle to the opposite arm?

Published on 20 Feb 2020 - 15:05

score 50 · Answer 2 · 2020-02-21 13:44:52

50

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How do you work out the base of an isosceles triangle with all other sides and angles given?

Published on 21 Feb 2020 - 13:44

score 276 · Answer 3 · 2020-02-22 08:21:33

276

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Square of the angle bisector in a triangle.

Published on 22 Feb 2020 - 8:21

score 137 · Answer 4 · 2020-02-23 17:38:07

137

Views

AMC 12A Problem 23 Solution Elaboration

Published on 23 Feb 2020 - 17:38

score 303 · Answer 5 · 2020-02-23 20:05:47

303

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$D$ is a point inside $\triangle ABC$, $\angle CAD=\angle DAB=10$, $\angle CBD=40$, $\angle DBA=20$, what is $\angle CDB$?

Published on 23 Feb 2020 - 20:05

score 367 · Answer 6 · 2020-02-24 08:02:19

367

Views

Prove $\tan \theta = 3 \tan \alpha$

Published on 24 Feb 2020 - 8:02

score 292 · Answer 7 · 2020-02-27 03:15:46

292

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Fermat"s point proof using ceva theorem?

Published on 27 Feb 2020 - 3:15

score 235 · Answer 8 · 2020-02-27 06:05:15

235

Views

Prove that perpendiculars from D,E,F to BC,CA,AB are concurrent?

Published on 27 Feb 2020 - 6:05

score 48 · Answer 9 · 2026-04-02 10:05:47

48

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Prove by geometry or algebra

Published on 02 Apr 2026 - 10:05

score 845 · Answer 10 · 2020-02-28 01:26:40

845

Views

How can I prove that the radius of the nine-point circle is half of the radius of the triangle's circumcircle?

Published on 28 Feb 2020 - 1:26

score 251 · Answer 11 · 2026-03-26 21:26:10

251

Views

In ABC find points X,Y,Z such that AXYZ is rhombus

Published on 26 Mar 2026 - 21:26

score 241 · Answer 12 · 2020-02-28 11:51:11

241

Views

If $P$,$Q$,$R$ are midpoints of $BX$,$BZ$,$AC$, prove $\triangle PQR$ is equilateral.

Published on 28 Feb 2020 - 11:51

score 369 · Answer 13 · 2020-02-29 01:22:37

369

Views

Find the triangle(s) formed by nine arbitrary concyclic points on a circle

Published on 29 Feb 2020 - 1:22

score 53 · Answer 14 · 2020-02-29 03:31:09

53

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What can be inferred from this determinant regarding a triangle?

Published on 29 Feb 2020 - 3:31

score 170 · Answer 15 · 2026-03-26 14:20:44

170

Views

Proof of converse of Pythagoras theorem

Published on 26 Mar 2026 - 14:20

List Question

How do I know the length of a perpendicular drawn from a vertex of a triangle to the opposite arm?

How do you work out the base of an isosceles triangle with all other sides and angles given?

Square of the angle bisector in a triangle.

AMC 12A Problem 23 Solution Elaboration

$D$ is a point inside $\triangle ABC$, $\angle CAD=\angle DAB=10$, $\angle CBD=40$, $\angle DBA=20$, what is $\angle CDB$?

Prove $\tan \theta = 3 \tan \alpha$

Fermat"s point proof using ceva theorem?

Prove that perpendiculars from D,E,F to BC,CA,AB are concurrent?

Prove by geometry or algebra

How can I prove that the radius of the nine-point circle is half of the radius of the triangle's circumcircle?

In ABC find points X,Y,Z such that AXYZ is rhombus

If $P$,$Q$,$R$ are midpoints of $BX$,$BZ$,$AC$, prove $\triangle PQR$ is equilateral.

Find the triangle(s) formed by nine arbitrary concyclic points on a circle

What can be inferred from this determinant regarding a triangle?

Proof of converse of Pythagoras theorem

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