Proof by Pictures

About Sets

Forget Something?

It’s What the Book Says

Measuring Area

Suitable Precision in Language and Notation

Tilted Square

Pythagorean Theorem

Walking and Turning

Angles in a Funky Shape

Trapezoid Area

Constructions

Triangle Investigation

UnMessUpable Figures

Triangle Centers

Lines in Triangles

Isosceles Bisectors

About Medians

Verifying Our Constructions

Of Angles and Circles

More Circles

Quadrilateral Diagonals

Congruence and Similarity

Congruence via Transformations

More Transformations

Symmetries

Congruence Criteria

Parallels

Midsegments

Similarities

Side-Splitter Theorems

Trigonometry Checkup

Please be Rational

Rep-Tiles

Rep-Tiles Repeated

Scaling Area

Turn Up the Volume!

Coordinates

Coordinate Constructions

Bola, Para Bola

More Medians

Constructible Numbers

Constructible Numbers, Part 2

Impossibilities

Functions

Area and Perimeter

Reading Information from a Graph

Circular Trigonometry

Parametric Equations

Parametric Plots of Circles

Eclipse the Ellipse

City Geometry

Taxicab Distance

Understanding and Using Absolute Value

The Path Not Taken

Midsets Abound

Tenacity Paracity

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