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Angles are measured by arcs, such that 360° and 2π correspond to each other.

— Hans Freudenthal Mathematics as an Educational Task (1973)

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More quotes by Hans Freudenthal

Horizontal mathematising leads from the world of life to the world of symbols.

Revisiting Mathematics Education (1991)

Vertical mathematising is the most likely part of the learning process for the bonds with reality to be loosened and eventually cut.

Revisiting Mathematics Education (1991)

Educational technique needs a philosophy, which is a matter of faith rather than of science.

Hans Freudenthal (1977)

No scientist is as model minded as is the statistician; in no other branch of science is the word model as often and consciously used as in statistics.

The Concept and the Role of the Model in Mathematics and Natural and Social Sciences (1961)

Learners should be allowed to find their own levels and explore the paths leading there with as much and as little guidance as each particular case requires.

Didactical Phenomenology of Mathematical Structures (1983)

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Quote text and notes from Wikiquote: Hans Freudenthal (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.