List questions from triangles

Published on 20 Dec 2016 - 10:59

97

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Prove that, in a triangle, $α = 2β \ \implies \ a^2 = b^2 + bc $

Published on 20 Dec 2016 - 17:06

488

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Prove that $ I_1, I_2, I_3, I_4 $ are concyclic

Published on 29 Mar 2026 - 22:14

617

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Geometric proof of dot product and projection

Published on 21 Dec 2016 - 20:33

879

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Largest area of the triangle that can be inscribed in ellipse

Published on 06 Apr 2026 - 7:08

724

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Equilateral triangle trisected

Published on 22 Dec 2016 - 16:58

1k

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Heron's formula when side lengths include radicals

Published on 23 Dec 2016 - 6:22

9.7k

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Is every parallelogram a rectangle ??

Published on 27 Mar 2026 - 13:45

68

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Geometry triangle sides

Published on 24 Dec 2016 - 20:36

49

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Straight lines question

Published on 28 Mar 2026 - 22:37

126

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Similar triangles with side lengths satisfying linear constraints

Published on 27 Mar 2026 - 15:16

2.1k

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$a \cot A + b \cot B + c \cot C = 2(R+ r)$

Published on 29 Dec 2016 - 8:14

206

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$(r_1 − r) (r_2 − r)(r_3 − r) = 4 Rr^ 2 $

Published on 29 Dec 2016 - 8:29

181

Views

geometry question (triangle & circle)

Published on 29 Dec 2016 - 15:52

639

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BdMO 2016 National Secondary Problem 3.

Published on 28 Mar 2026 - 21:06

List Question

Equilateral triangle tilted between two

Prove that, in a triangle, $α = 2β \ \implies \ a^2 = b^2 + bc $

Prove that $ I_1, I_2, I_3, I_4 $ are concyclic

Geometric proof of dot product and projection

Largest area of the triangle that can be inscribed in ellipse

Equilateral triangle trisected

Heron's formula when side lengths include radicals

Is every parallelogram a rectangle ??

Geometry triangle sides

Straight lines question

Similar triangles with side lengths satisfying linear constraints

$a \cot A + b \cot B + c \cot C = 2(R+ r)$

$(r_1 − r) (r_2 − r)(r_3 − r) = 4 Rr^ 2 $

geometry question (triangle & circle)

BdMO 2016 National Secondary Problem 3.

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