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Eric Zhang

56 contributions · 139 fame

Edited explanationNov 18, 2019

Writing Cos, Sin in Terms of Complex Numbers

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Edited explanationDec 19, 2015

Napoleon's Theorem, Square Version

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Edited explanationOct 29, 2015

Combinatorial Nullstellensatz

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Wrote explanationAug 24, 2014

1 Internal and 2 External Angle Bisectors Meet at an Excenter

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Edited explanationAug 22, 2014

Area in Barycentric Coordinates

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Wrote explanationAug 19, 2014

Fundamental Theorem of Symmetric Sums

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Wrote explanationAug 10, 2014

Length of Space Diagonal

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Edited explanationAug 4, 2014

Area Ratios from Medians and Centroid

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Edited explanationJul 29, 2014

What Is Napoleon's Theorem?

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Edited explanationJul 27, 2014

Points on a Perpendicular Bisector

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Wrote explanationJul 27, 2014

Points on a Perpendicular Bisector

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Wrote explanationJul 24, 2014

Skew Lines

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Wrote explanationJul 13, 2014

Surface Area of a Prism

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Edited explanationJul 11, 2014

Butterfly Theorem

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Wrote explanationJul 11, 2014

Law of Cosines

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Wrote explanationJul 11, 2014

Butterfly Theorem

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Edited explanationJul 10, 2014

Bretschneider's Formula

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Wrote explanationJul 10, 2014

Bretschneider's Formula

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Wrote explanationJul 10, 2014

Brahmagupta's Formula

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Edited explanationJul 8, 2014

What Are Mass Points in Geometry?

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Wrote explanationJul 8, 2014

Symmedians (Cevian)

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Wrote explanationJul 8, 2014

Sandbox (Test/Try New Stuff Here!)

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Edited explanationJul 7, 2014

Shoelace Formula for Polygons

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Edited explanationJul 7, 2014

Approximating the Area of a Circle with Polygons

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Wrote explanationJul 7, 2014

Approximating the Area of a Circle with Polygons

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