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The Euler line in GeoGebra: Today's topic in the Β»Christian SpannagelΒ« video: We construct the Euler line in GeoGebra.
spektrum.de/video/christian-spannagel-die-euler-gerade-in-geogebra/2308322

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Lots of result sets: Today's topic in the Β»Christian SpannagelΒ« video: Set theory.
spektrum.de/video/christian-spannagel-jede-menge-ergebnismengen/2317265

The number sequence 5, -15, 45, -135, 405: How do you express a number sequence in recursive or closed form?
spektrum.de/video/christian-spannagel-die-zahlenfolge-5-15-45-135-405/2314130

Function graphs in GeoGebra: Today's topic: We'll analyze quadratic functions in GeoGebra and examine different forms of representation.
spektrum.de/video/christian-spannagel-funkionsgraphen-in-geogebra/2308127

What are exponential functions: Today's topic: Exponential functions
spektrum.de/video/christian-spannagel-was-sind-exponentialfunktionen/2307635

Thales' Circle with GeoGebra: Today's topic: We construct Thales' Circle on the board and with GeoGebra.
spektrum.de/video/christian-spannagel-der-thaleskreis-mit-geogebra/2307669

Multiplication in the octal system: Today's topic: Arithmetic in other place-value systems
spektrum.de/video/christian-spannagel-multiplikation-im-8er-system/2307239

Higher eyes count: Today's topic: Chance and probabilities
spektrum.de/video/christian-spannagel-die-hoeheren-augen-zaehlen/2306564

Pentagram and hexagram: Angle sums at the vertices: Today's topic in the Β»Christian SpannagelΒ« video: We calculate the angle sums of the vertices of a ...
spektrum.de/video/christian-spannagel-pentagramm-und-hexagramm-winkelsummen/2302219

Mulled wine functions: Today's topic: Functional relationships
spektrum.de/video/christian-spannagel-gluehwein-funktionen/2301892

GCD of floor and stair step: Today's topic: greatest common divisor
spektrum.de/video/christian-spannagel-ggt-von-stockwerk-und-treppenstufe/2300767

Find the sets: Today's topic: Find the sets
spektrum.de/video/christian-spannagel-finde-die-mengen/2298893

The complementary set: Christian Spannagel explains the complementary set.
spektrum.de/video/christian-spannagel-die-komplementaermenge/2298145

Conversion between place value systems: How do you convert numbers between different place value systems?
spektrum.de/video/christian-spannagel-umrechnung-zwischen-stellenwertsystemen/2297289

Division in the 6-base system: 22304/5: How does division in the 6-base system work? Christian Spannagel explains it using example 22304/5.
spektrum.de/video/christian-spannagel-division-im-6er-system-22304-5/2296970

Find the matching mathematical symbols: Find the matching mathematical symbols so that the equation is correct.
spektrum.de/video/christian-spannagel-finde-die-passenden-rechenzeichen/2296116

Brainstorming on the topic of mental arithmetic: π§βπ«Today's topic: Brainstorming on the topic of mental arithmetic
spektrum.de/video/christian-spannagel-brainstorming-zum-thema-kopfrechnen/2295683

We define the term rhombus: In this video, Christian Spannagel examines what constitutes a rhombus from a mathematical perspective.
spektrum.de/video/christian-spannagel-wir-definieren-den-begriff-raute/2294252

The House of Quadrilaterals: In this video, Christian Spannagel uses the House of Quadrilaterals to derive a system of concepts.
spektrum.de/video/christian-spannagel-das-haus-der-vierecke/2293255

Solutions to Smart Squares: In this video, Christian Spannagel shows how to find patterns and structures with squares.
spektrum.de/video/christian-spannagel-loesungsansaetze-zu-smarten-quadraten/2292979

Proof of the Pythagorean Theorem: We prove the Pythagorean Theorem
spektrum.de/video/christian-spannagel-beweis-des-kathetensatzes/2277519

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