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Triangle inside triangle

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#geometry #analytic-geometry #triangles
130
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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?

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#geometry #euclidean-geometry #triangles
163
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JMO geometry Problem.

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#geometry #euclidean-geometry #triangles #ratio #quadrilateral
70
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The length of the line between bisector's endings

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#geometry #triangles
102
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Is there any tri-angle ?

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#geometry #triangles #recreational-mathematics #puzzle
1k
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Properties of triangles with integer sides and area

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#combinatorics #triangles #combinatorial-geometry #discrete-geometry #oeis
247
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Finding the centroid of a triangle in hyperspherical polar coordinates

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#geometry #triangles #polar-coordinates #centroid
300
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Prove triangle ABC is equilateral triangle given that $2\sin A+3\sin B+4\sin C = 5\cos\frac{A}{2} + 3\cos\frac{B}{2} + \cos\frac{C}{2}$

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#geometry #trigonometry #triangles
90
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Complex numbers - prove |BD| + |CD| = |AD|

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#geometry #complex-numbers #euclidean-geometry #circles #triangles
80
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Area of Triangle, Sine

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#geometry #trigonometry #triangles #area #a.m.-g.m.-inequality
825
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Simpler Derivation of $\sin \frac{\pi}{4} = \cos \frac{\pi}{4} = \frac{1}{\sqrt{2}}$,

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#trigonometry #proof-writing #circles #triangles #alternative-proof
812
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How to find the perimeter of the triangle inscribed within the square.

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#geometry #triangles
52
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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 $.

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#geometry #triangles #3d
151
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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…

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#geometry #contest-math #triangles
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Trigonometry: Finding the lengths of a right triangle

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#trigonometry #triangles

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