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Eratosthenes experiment

Eratosthenes experiment - on this picture some students are determinating the shadow of 100 cm stick at EB+S D. Martinho Vaz de Castelo Branco. Their calculation were quit accurate, just 2% error (the Earth's circumference calculation was 40887 km compared with the real 40075 km)

Educational Object Context
informal context
primary education
secondary education
Educational Object File