List questions from triangles

Published on 21 Mar 2026 - 18:02

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If in a triangle ABC, ∠B = 2∠C and the bisector of ∠B meets CA in D, then the ratio BD : DC would be equal to?

Published on 18 Mar 2026 - 19:28

144

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JMO geometry Problem.

Published on 23 Mar 2026 - 9:28

59

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The length of the line between bisector's endings

Published on 19 Mar 2026 - 3:36

90

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Is there any tri-angle ?

Published on 22 Mar 2026 - 0:56

993

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Properties of triangles with integer sides and area

Published on 19 Mar 2026 - 2:16

239

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Finding the centroid of a triangle in hyperspherical polar coordinates

Published on 18 Mar 2026 - 19:28

291

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Prove triangle ABC is equilateral triangle given that $2\sin A+3\sin B+4\sin C = 5\cos\frac{A}{2} + 3\cos\frac{B}{2} + \cos\frac{C}{2}$

Published on 19 Mar 2026 - 4:32

80

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Complex numbers - prove |BD| + |CD| = |AD|

Published on 22 Mar 2026 - 4:46

68

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Area of Triangle, Sine

Published on 19 Mar 2026 - 2:11

814

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Simpler Derivation of $\sin \frac{\pi}{4} = \cos \frac{\pi}{4} = \frac{1}{\sqrt{2}}$,

Published on 21 Mar 2026 - 8:20

805

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How to find the perimeter of the triangle inscribed within the square.

Published on 20 Mar 2026 - 4:11

44

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Is $ABC$ similar with $A'B'C'$, where $A', B', C'$ are the projections of $A, B, C $ on a plane $\pi $.

Published on 14 Mar 2026 - 23:58

143

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In parallelogram $ABCD,AB = 1,BC = 4$, and $\angle ABC=60^{\circ}$ .Suppose that $AC$ is extended from A to a point E beyond C so that triangle ADE…

Published on 20 Mar 2026 - 19:55

1.5k

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Trigonometry: Finding the lengths of a right triangle

Published on 20 Mar 2026 - 5:13

List Question

Triangle inside triangle

If in a triangle ABC, ∠B = 2∠C and the bisector of ∠B meets CA in D, then the ratio BD : DC would be equal to?

JMO geometry Problem.

The length of the line between bisector's endings

Is there any tri-angle ?

Properties of triangles with integer sides and area

Finding the centroid of a triangle in hyperspherical polar coordinates

Prove triangle ABC is equilateral triangle given that $2\sin A+3\sin B+4\sin C = 5\cos\frac{A}{2} + 3\cos\frac{B}{2} + \cos\frac{C}{2}$

Complex numbers - prove |BD| + |CD| = |AD|

Area of Triangle, Sine

Simpler Derivation of $\sin \frac{\pi}{4} = \cos \frac{\pi}{4} = \frac{1}{\sqrt{2}}$,

How to find the perimeter of the triangle inscribed within the square.

Is $ABC$ similar with $A'B'C'$, where $A', B', C'$ are the projections of $A, B, C $ on a plane $\pi $.

In parallelogram $ABCD,AB = 1,BC = 4$, and $\angle ABC=60^{\circ}$ .Suppose that $AC$ is extended from A to a point E beyond C so that triangle ADE…

Trigonometry: Finding the lengths of a right triangle

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