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Geometry: Two's Company, Three's a Triangle

Two's Company, Three's a TriangleGeometryTwo's Company, Three's a TriangleA Formal IntroductionSize Matters, So Let's Measure As long as there are three of anything, there will be triangles. You…

Geometry: Using and Proving Angle Complements

Using and Proving Angle ComplementsGeometryProving Segment and Angle RelationshipsExploring MidpointsHow Many Midpoints Are There?Proving Angles Are CongruentUsing and Proving Angle ComplementsUsing…

Geometry: Using and Proving Angle Supplements

Using and Proving Angle SupplementsGeometryProving Segment and Angle RelationshipsExploring MidpointsHow Many Midpoints Are There?Proving Angles Are CongruentUsing and Proving Angle ComplementsUsing…

Geometry: When Is a Parallelogram a Rectangle?

When Is a Parallelogram a Rectangle?GeometryProofs About QuadrilateralsWhen Is a Quadrilateral a Parallelogram?When Is a Parallelogram a Rectangle?When Is a Parallelogram a Rhombus?When Is a…

Geometry: When Is a Parallelogram a Rhombus?

When Is a Parallelogram a Rhombus?GeometryProofs About QuadrilateralsWhen Is a Quadrilateral a Parallelogram?When Is a Parallelogram a Rectangle?When Is a Parallelogram a Rhombus?When Is a…

Geometry: Whose Geometry Is It Anyway?

Whose Geometry Is It Anyway?GeometryWhose Geometry Is It Anyway?Non-Euclidean GeometryHyperbolic Geometry: Saddle Up!Spherical GeometryTaxi-Cab GeometryMax GeometryHow Many Shapes Can a Circle Have…

Hopkins, William

(Encyclopedia) Hopkins, William, 1793–1866, English geologist. Hopkins studied mathematics at Cambridge, and then supported himself as a private mathematics tutor. Many of England's best…

Gödel, Kurt

(Encyclopedia) Gödel, KurtGödel, Kurtgöˈdəl [key], 1906–78, American mathematician and logician, b. Brünn (now Brno, Czech Republic), grad. Univ. of Vienna (Ph.D., 1930). He came to the United States…