List questions from triangles

Published on 11 Apr 2026 - 13:08

50

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How to prove $C'$ is reflection of $C$ when we know $\triangle ABC\cong \triangle ABC'$?

Published on 10 Apr 2026 - 13:41

282

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Prove that the area of a right triangle is no more than the square of the hypotenuse divided by 4

Published on 15 Apr 2026 - 11:43

57

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Defining a triangle with vertices $a$, $b$, $c$ by $t_1a+t_2b+t_3c$, where $0\leq t_1, t_2, t_3\leq 1$ and $1=t_1+t_2+t_3$. Why does this work?

Published on 14 May 2026 - 12:36

455

Views

Testing if a Point is in the Circumcircle of a Triangle

Published on 14 Apr 2026 - 1:14

108

Views

Pythagors Theorem : Geometrical interpretation

Published on 13 Apr 2026 - 13:29

293

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Find an angle in an isosceles triangle.

Published on 14 Apr 2026 - 8:55

75

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Struggling with the Missing Side Length with One Length

Published on 14 Apr 2026 - 9:10

577

Views

Mirror property of angle bisector

Published on 14 May 2026 - 12:35

855

Views

Minizing the total lenght of 2 pipelines, Optimization question

Published on 13 Apr 2026 - 14:15

115

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Prove that $A$ is on the radical axis of two circles

Published on 15 Apr 2026 - 2:38

103

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Given a scalene triangle $ABC$ with $H$ orthocenter, prove that two lines are parallel

Published on 24 Apr 2026 - 13:58

79

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Dividing an equilateral triangle into equal parts

Published on 14 Apr 2026 - 2:03

69

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How can we calculate the side $AC$?

Published on 11 Apr 2026 - 18:28

295

Views

Ratio of area of triangle and hexagon

Published on 13 Apr 2026 - 7:22

List Question

Does $CD$ bisect $AE$?

How to prove $C'$ is reflection of $C$ when we know $\triangle ABC\cong \triangle ABC'$?

Prove that the area of a right triangle is no more than the square of the hypotenuse divided by 4

Defining a triangle with vertices $a$, $b$, $c$ by $t_1a+t_2b+t_3c$, where $0\leq t_1, t_2, t_3\leq 1$ and $1=t_1+t_2+t_3$. Why does this work?

Testing if a Point is in the Circumcircle of a Triangle

Pythagors Theorem : Geometrical interpretation

Find an angle in an isosceles triangle.

Struggling with the Missing Side Length with One Length

Mirror property of angle bisector

Minizing the total lenght of 2 pipelines, Optimization question

Prove that $A$ is on the radical axis of two circles

Given a scalene triangle $ABC$ with $H$ orthocenter, prove that two lines are parallel

Dividing an equilateral triangle into equal parts

How can we calculate the side $AC$?

Ratio of area of triangle and hexagon

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