After returning from Christmas holidays the boys were very agitated. The reason was that they wanted to talk about gifts received, especially electronic games and mobile phones fashion. I took the opportunity to propose an investigation: I got two birds with one stone: let them show off the gifts and take a lesson in statistics. Represented the results with a histogram. I have proposed for the next meeting, to transform the inquiry into a areogramma (some still have difficulty using a protractor and I take this opportunity to further consolidation)
Yesterday I told the guys that before turning their investigation in areogramma, it was right to brush up on how to make one, knowing the percentages. I do not know what he said last year's math teacher on areogrammi, but the guys did not remember anything. I left then the circle is equivalent to around a corner. How many degrees? 360 °. And if all those able to red, what will I get? Dark. Perhaps I asked the wrong question. Drawing a circle on the blackboard, then call and ask Antony to color the 360 \u200b\u200bdegrees of red. I can not! is the answer. How can not you? I am proud. The red chalk is not there! I laugh and tell him to use the yellow. I colored around the circle. Bravo! In percentage terms, what is the color that you used? By James anticipates the place: one hundred percent, because there is only yellow. I knew it! Antony gets angry. I am sure! I tell him to avoid further bickering. Then 360 ° correspond to 100%. Now, to know how many degrees is 1%, what should I do? 5 / 6 respond in unison: the division!
360:100 = 3.6. Potatoes? They laugh. No, degrees! Good, so if 1% is equal to 3.6 °, 2% corresponds to how many degrees? A 7.2 ° Ok, I see that you understand, then take a statistic from the book on the morphology of the Italian territory and try to represent it with a areogramma. Choose Tuscany: 8% lowland, 25% mountains, 67% hill. In many areas we need to divide the circle? 3. But will all the same size? No. How large is the area that will be the plain? Just make 8x3, 6 ....... 28.8 °
to work! It would be if all went well for some, having used the protractor and compass to draw the circle, they had forgotten to mark the center, but if they thought a bit 'and looked at the picture .........
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