Derde jaar
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A Cunning Addict
The chairman of Alcoholics Anonymous meets Jef on the street carrying a bottle of gin. Jef is a member and has trouble with his addiction. “You promised you would stop drinking” the chairman says angrily. “That is true but only half the bottle is for me”, Jef answers. “The other half is for my neighbour”.…
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The Art of Map Reading
Ivo is driving and his friend Jef is reading the map. “How far to the next town ?” Ivo asks. “Approximately 3 centemeters” is Jef’s answer.
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Why Units are Important
A customer in a shop: “One kilogram milk please.” To which the shop owner replies: “Sir, we don’t weigh the milk;” “OK”, answers the customer, “give me one meter of milk then.” (uit Argument 3 leerboek Meetkunde, ISBN 9789045533643)
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The shortest distance
A ship is sinking. “How far is it to land ?” a panicking passenger asks the captain. “500 meters” anwers the captain. “What a relief answers the passenger. I am a trained swimmer. In which direction do I have to swim ?” “Straight down” answers the captain. (uit Argument 3 leerboek Meetkunde, ISBN 9789045533643)
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De kortste afstand
Een schip is aan het zinken. “Hoe ver is het dichtsbijzijnde land ?” vraagt een passagier in paniek aan de kapitein. “Vijfhonderd meter”, antwoordt de kapitein. “Valt dat mee”, zegt de passagier opgelucht. “Ik ben een geoefend zwemmer. In welke richting moet ik zwemmen ?” “Naar beneden” antwoordt de kapitein. (uit Argument 3 leerboek Meetkunde,…
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Understanding Geometry: A Parent’s Journey Through Math
While I was in high school myself I never much cared to put a lot of time in learning geometry. Now, with our youngest in 3rd grade struggling with mathematics I decided I should at least read his geometry text book so I know what he is supposed to know. I finished the first 60…
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Familie Ultradom
In de familie Ultradom zetten ze de kachel altijd in een hoek van een rechthoekige kamer. Weet je waarom ? Antwoord : ze weten dat het daar 90° is. (uit Argument 3 leerboek Meetkunde, ISBN 9789045533643)
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Bombelli’s formula to calculate the square root of 2
We owe following formula to Bombelli, approximately 1572 :
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Some strange formulas containing pi
A couple of series to calculate pi, first one is from Leibniz
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pi approximations
Some approximations for pi :
