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Find a bisector point of a circle

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#geometry #circles #analytic-geometry #triangles
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Other way to show $ Q, H, M $ are collinear without $BECH$ is a parallelogram (IMO 2015 Problem 3 )

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#contest-math #euclidean-geometry #triangles #circles #plane-geometry
152
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Finding maximum subset-triangles

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#geometry #triangles
1.6k
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Median of triangle

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#geometry #algebra-precalculus #triangles #analytic-geometry
138
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Given a single point in 3d space, and 3 points that make up a triangle, find the closest point in/on the triangle to the point.

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#vectors #triangles #3d
64
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What can be said about triangle with certain condition?

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#contest-math #euclidean-geometry #triangles
5.2k
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What is the symbol to denote that two triangles are similar?

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#geometry #trigonometry #notation #relations #triangles
1.3k
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Substitute for finding the hypotenuse of a right triangle?

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#triangles #pythagorean-triples
161
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Is my proof of 'inscribed angle theorem' different from the usual one?

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#geometry #proof-verification #euclidean-geometry #triangles #alternative-proof
579
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Scalene triangle with semicircles mensuration

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#circles #triangles
2.2k
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Wanted : for more formulas to find the area of a triangle?

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#geometry #trigonometry #triangles #area #reference-works
603
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Interesting problem in congruence of triangles

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#geometry #triangles #congruences-geometry
165
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Point on the Plane, a Triangle, and a Lower Bound of a Ratio Sum

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#inequality #euclidean-geometry #analytic-geometry #triangles #geometric-inequalities
155
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Prove that $\tan\alpha =\tan^{2}\frac{A}{2}.\tan\frac{B-C}{2}$

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#geometry #trigonometry #triangles
263
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Does the centroid of a triangle ever fall outside of its Morley's triangle?

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#geometry #triangles #plane-geometry

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