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Ambiguous case in euclidian geometry

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#euclidean-geometry
30
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Rotating vector $[x_1,x_2,...,x_n]^T$ to a vector of the form $[y_1,0,...,0]^T$ on $\mathbb{R}^n$.

Published on
#matrices #euclidean-geometry #rotations
1.8k
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Vector equation intersect of xy-plane

Published on
#calculus #euclidean-geometry
449
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Putnam 2015 and Ravi Substitution

Published on
#trigonometry #inequality #contest-math #euclidean-geometry #geometric-inequalities
772
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Congruence of triangles: SSA criteria

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#euclidean-geometry #triangles #congruences-geometry
157
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Rotate a line between x1y1 and x2y2 by angle α then finding the end of the rotated line

Published on
#trigonometry #euclidean-geometry #rotations
612
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Sphere inversion radius

Published on
#general-topology #complex-analysis #geometry #euclidean-geometry #mobius-inversion
4.7k
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Why the number of symmetry lines is equal to the number of sides/vertices of a regular polygon?

Published on
#proof-verification #euclidean-geometry #polygons
157
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Prove that a projector is continuous using Cauchy-Schwarz's inequality

Published on
#real-analysis #continuity #euclidean-geometry #vector-analysis
896
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What is the difference between the boundary set and a bounded set?

Published on
#real-analysis #euclidean-geometry
84
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Supporting hyperplane of a polarity of a convex body.

Published on
#general-topology #convex-analysis #euclidean-geometry
222
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Problem on similar triangles in a weakened axiom system

Published on
#geometry #euclidean-geometry
105
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Show that any quadrilateral can become cyclic by changing angles.

Published on
#geometry #euclidean-geometry #quadrilateral
1.5k
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Given a diameter of a circle bisecting the angle formed by two intersecting chords, Prove the chords are equal

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#euclidean-geometry
1k
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Golden ratio in regular pentagon

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#geometry #euclidean-geometry #golden-ratio

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