Question

Given a triangle $ABC$ and its incenter I. If $P,Q$ are points on BI and CI so that $2PAQ=BAC$. Prove that $PDQ=90$

score 186 · Answer 1 · 2021-01-09 15:47:22

186

Views

Given a triangle $ABC$ and its incenter I. If $P,Q$ are points on BI and CI so that $2PAQ=BAC$. Prove that $PDQ=90$

Published on 09 Jan 2021 - 15:47

score 189 · Answer 2 · 2021-01-11 14:08:17

189

Views

Align a vector as close as possible with given vector with a given rotation plane

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score 432 · Answer 3 · 2021-01-12 01:09:50

432

Views

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score 222 · Answer 4 · 2021-01-13 22:16:39

222

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1.4k

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score 135 · Answer 6 · 2021-01-16 07:04:42

135

Views

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score 66 · Answer 7 · 2021-01-22 12:40:09

66

Views

Angle subtended by circular segment on external point

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score 97 · Answer 8 · 2026-03-30 05:31:57

97

Views

What other angles apart from the right angle can be trisected?

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score 100 · Answer 9 · 2021-01-31 11:00:26

100

Views

Formula for angle in triangle when two sides and the included angle are known

Published on 31 Jan 2021 - 11:00

score 468 · Answer 10 · 2021-01-31 11:39:52

468

Views

Length of a triangle side proportional to angle size?

Published on 31 Jan 2021 - 11:39

score 623 · Answer 11 · 2021-02-02 18:21:14

623

Views

In the triangle shown, what is the degree measure of $\angle ADB$?

Published on 02 Feb 2021 - 18:21

score 644 · Answer 12 · 2021-02-04 10:44:27

644

Views

How to calculate the viewing angle for curved monitors?

Published on 04 Feb 2021 - 10:44

score 750 · Answer 13 · 2026-03-26 08:02:39

750

Views

In $\Delta ABC$, prove $A'D=\frac{(c^2- b^2)}{2a}$ with $A'$ be the midpoint of $BC$, $AB>AC$, and other Information given.

Published on 26 Mar 2026 - 8:02

score 98 · Answer 14 · 2021-02-09 19:11:30

98

Views

How to prove (analytically) that $\sin(\tan^{-1}(\sqrt{2}))=\sqrt{\frac{2}{3}}$?

Published on 09 Feb 2021 - 19:11

score 310 · Answer 15 · 2021-02-10 20:01:15

310

Views

The center of the circumcircle lies on a side of a triangle

Published on 10 Feb 2021 - 20:01

List Question

Given a triangle $ABC$ and its incenter I. If $P,Q$ are points on BI and CI so that $2PAQ=BAC$. Prove that $PDQ=90$

Align a vector as close as possible with given vector with a given rotation plane

What does it mean when there is an equals line through an angle?

Euler's angles to axis-angle conversion

Missing Quadrilateral Angle

What is the name of this arc in English?

Angle subtended by circular segment on external point

What other angles apart from the right angle can be trisected?

Formula for angle in triangle when two sides and the included angle are known

Length of a triangle side proportional to angle size?

In the triangle shown, what is the degree measure of $\angle ADB$?

How to calculate the viewing angle for curved monitors?

In $\Delta ABC$, prove $A'D=\frac{(c^2- b^2)}{2a}$ with $A'$ be the midpoint of $BC$, $AB>AC$, and other Information given.

How to prove (analytically) that $\sin(\tan^{-1}(\sqrt{2}))=\sqrt{\frac{2}{3}}$?

The center of the circumcircle lies on a side of a triangle

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