I almost deleted this resource recently. I'm still proud of some of its individual lessons and discrete ideas, but I first posted this when I was a fourth-year teacher and still pretty obsessed with classroom management and my own authority. My teaching has changed a lot since then, mostly for the better. You can find the stuff I'm most proud at threeacts.mrmeyer.com. I'm leaving this up but please be a critical consumer. Some of the ideas on this shelf are long past their buy-by date.

Dan Meyer teaches high school math in Santa Cruz County, CA. He is the founder and Chief Blogging Officer of dy/dan, a wholly owned subsidiary of **dy/industries**.

**basic definitions** point, line, plane, congruency, etc. **notation** how we write about geometry **properties of angles** definitions, complementary, supplementary how to measure them **midpoint formula** **reflections of angles** pool table.

keynote | powerpoint | pdf | handouts

**pool table geometry** angles **triangles** right, obtuse, acute, scalene, equilateral **quadrilaterals** trapezoid, parallelogram, kite, rhombus, rectangle, square **review** basketball

keynote | powerpoint | pdf | handouts

**pool table geometry** angles **definitions** right, acute, obtuse, complementary, angle bisector **polygons** convex, concave, equilateral, equiangular, regular **quadrilaterals** trapezoid, parallelogram, kite, rhombus, rectangle, square

keynote | powerpoint | pdf

**isometric drawings** **3D drawing techniques** **inductive patterns** number sequences, linear **review** basketball

keynote | powerpoint | pdf | handouts

**the handshake problem** **angle relationships** vertical, linear pair, triangle sum, parallel lines **algebra review** slope **midpoint formula** **reasoning**: deductive, inductive, converse

keynote | powerpoint | pdf | handouts

**constructions** building a perpendicular, dropping a perpendicular, orthocenter, incenter, circumcenter **information design** introduction, flags of the world

keynote | powerpoint | pdf | handouts

**constructions** perpendicular bisectors, building/dropping a perpendicular, orthocenter, incenter, circumcenter

keynote | powerpoint | pdf | handouts

**points of concurrency** incenter, orthocenter, circumcenter, centroid **constructions** rhombus, parallel lines **bonus** extremely expensive sneakers

keynote | powerpoint | pdf | handouts

**infographics** absolute poker cheating scandal **algebra review** parallel & perpendicular slope lines, graphing lines **triangles** triangle inequality, triangle sum

keynote | powerpoint | pdf | handouts

**triangles** isosceles, exterior angles, congruency theorems **construction** rhombus, parallelogram **two-column proof** **bonus** fake or legit

keynote | powerpoint | pdf | handouts

**two-column proof** **polygons** sum of angles conjecture, exterior angle conjecture **review** basketball **bonus** hardest poem to read ever, jen stark papercraft, tourist paraphernalia photos, flags of the world

keynote | powerpoint | pdf | handouts

**quadrilaterals** kites, trapezoids **midsegments** **bonus** coffee infographics, estimating age

keynote | powerpoint | pdf

**quadrilaterals** parallelograms **review** jeopardy **bonus** worst album covers ever

keynote | powerpoint | pdf | handouts

**quadrilaterals** comprehensive review **bean probability** **bonus** 25 photographs taken at exactly the right time, mafioso rules, washington on $85 a day

keynote | powerpoint | pdf | handouts

**quadrilaterals** comprehensive review **circles** central angle, inscribed angle, perpendicular chord, find the center of a circle given an arc **bonus** running from camera, pieter hugo photography

keynote | powerpoint | pdf | handouts

**circles** inscribed semi-circle conjecture, cyclic quadrilateral, pi **review** basketball **bonus** moneygami, surfing, name that state flag!

keynote | powerpoint | pdf

**circles** fractions, sectors, arc length **snow flake prediction** **review** Jeopardy **bonus** lego sculpture, president bush's traveling entourage, high shutter speed photography

keynote | powerpoint | pdf | handouts

**review** triangle congruency, proofs, polygon angles, basketball **project** math portfolio **bonus** most popular new years resolutions, most popular baby names 2007

keynote | powerpoint | pdf

**final exam review** open-ended problems **bonus** a wedding album I designed

keynote | powerpoint | pdf

**final exam review** grade breakdown **feltron project** introduction **transformations** rigid, non-rigid **symmetry** rotational, rigid, reflectional **tesselations** properties, conditions, square, hexagon, project **area** triangle, rectangle, parallelogram

keynote | powerpoint | pdf

**variation** inverse, direct **tessellations** review **bonus** mathematical mind reader

keynote | powerpoint | pdf | handouts

**area** irregular shapes, trapezoids, kites **picks theorem** **review** basketball, treasure hunt **bonus** color optical illusions, roger clemens & steroid allegations, longest swimming pool in the world

keynote | powerpoint | pdf | handouts

**circles** area, sectors, segments, annuli, probability **bonus** famous idiots in history (the nickel thieves)

keynote | powerpoint | pdf

**area** probability, circle, sector, semicircle **solids** surface area, cylinder, prism, pyramid, cone **bonus** sleeve face, castle optical illusion, amazing pools

keynote | powerpoint | pdf | handouts

**pythagorean theorem** investigation **review** basketball **bonus** toothpick sculptures, xkcd comic, lame science experiments

keynote | powerpoint | pdf | handouts

**pythagorean theorem** word problems, distance formula, 30-60-90 triangles, 45-45-90 triangles **algebra review** simplifying square roots **polyhedra** prisms, pyramids **bonus** crocodile close call, eyeball macro photos, pulp novel cut-outs

keynote | powerpoint | pdf | handouts

**polyhedrons** prisms, pyramids, volume **review** treasure hunt, basketball **bonus** insane highway configurations, perspective photography

keynote | powerpoint | pdf | handouts

**similar figures** area, volume **review** basketball, whiteboards **bonus** depth photography, bullet ants **28 Nov 2008** an ant carrying a leaf for twenty feet is proportionally the same as a human carrying what object for how many feet. (Show a video.) **29 Nov 2008** if the head of a hard drive were a 747. [link]

keynote | powerpoint | pdf

**similar triangles** word problems, outside investigation, dilation project **review** whiteboards, basketball **bonus** armed in america, self-portraits from the start of the year

keynote | powerpoint | pdf | handouts

**dilation project** **trigonometry** sine, cosine, tangent **bonus** the most states driven through in a day

keynote | powerpoint | pdf | handouts

**standardized testing** **review** basketball **bonus** guess the asian

keynote | powerpoint | pdf | handouts

**law of sines** **feltron** **bonus** flag infographics, dollar bill art, zipcodes of the us

keynote | powerpoint | pdf

**law of cosines** clinometer investigation outdoors **feltron** **bonus** urban star wars photography, young/now

keynote | powerpoint | pdf | handouts

**feltron** analyze Nicholas Felton's design **logic** counterexample, conditionals, shorthand notation **bonus** the impossible art of li wei, the sky bridge of malaysia

keynote | powerpoint | pdf | handouts

**feltron** calendars, maps **logic** counterexample, conditionals, shorthand notation **bonus** the office "disciplinary review" clip, cleaning the space needle

keynote | powerpoint | pdf | handouts

**feltron** excel tutorial **logic** set theory, union, intersection, complement, venn diagram, subset **bonus** nyc / liberty city comparison, johan lorbeers still life performance, indexed

keynote | powerpoint | pdf | handouts

**final exam review** basketball **misc** guinness world record tutorial **bonus** nyc / liberty city comparison, johan lorbeers still life performance, indexed, tv screenshots

keynote | powerpoint | pdf | handouts

This supplement comprises 2,144 slides and 1.94 GB — a lot of a/v content, in other words, some of which I did not author and do not have explicit permission to republish. Sorry about that. Every respect has been paid to Fair Use. Every effort has been made at attribution.

Textbook assignments and certain diagrams, for example, reference **Discovering Geometry**, a very good Geometry text. The opener miscellany, for another example, is lifted from both **Snapple®** caps and **Vital Statistics**, a reference text which is just as good as Snapple® but in a different way. If you are a copyright holder (or know one) and I missed your attribution, please let me know via **dan at mrmeyer dot com** and we will make that right.

The rest is yours to use under a Creative Commons attribution license. This supplement is provided as is. Your suggestions are welcome and appreciated but, due to time constraints, this is not a wiki.