angle a-trons.pptx
TRANSCRIPT
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Angle-a-tronsAnica Trickovic
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I got inspiration for this class from a video on Khan academy called “Angle-a trons”
Link for this video:
https://www.khanacademy.org/math/recreational-math/vi-hart/spirals-fibonacci/v/angle-a-trons
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What does the word “angle-a-trons” means?
•the suffix "-tron" denotes a complex scientific instrument
• angle models made of paper
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Description of the lesson
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Are there any angles on this piece of paper?
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90° angle 180° angle
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What about this irregular piece of paper?
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With one fold we can turn it into 180° angle-a-tron
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90° angle we can get
by folding a 180° angle-a-tron in half
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45° angle we can get by folding a 90° angle-a-tron in half
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22,5° angle we can get by folding a 45° angle-a-tron in half
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and so on…
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It’s not hard to fold the paper in thirds either
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We can get an angle of 60° by folding 180° on three equal parts
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60° angle-a-tron
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By folding 60° angle-a-tron into half
we can get an angle of 30°
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Then we get an angle of 15° by folding 30° angle-a-tron in half
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We can add them together…
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We can put two angles of 60° together to get 120° angle-a-tron
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We can get 135° by adding 90° and 45°
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Together with students we make all angle models from paper.Students check the angles with their protractors after they make the models.
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Activities for students
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Students are divided into four groups
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Every student draws a picture, using just one ruler and angle-a-trons which they made. If they have time, they can colour the drawings. Students can help each other .
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Group 1:
Use angle-a-tron of 90°
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Group 2:
Use angle-a-trons of 90° and 45°
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Group 3:
Use angle-a-tron of 60°
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Group 4:
Use angle-a-tron of 120°
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Every group chooses the best drawing which will be displayed on the classroom wall.
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Summary
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I remembered when I was a student that my teacher showed us how to make angle-a-trons.
We usually don`t carry around a protractor, so this can be useful to the students because they can make their
own angle models.
In the same time, students can see the size of the most used angles 180°, 90°, 45°; ...,60°, 30°, 15°,...
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I think the students will specially like the drawing activity using rulers and angle-a-trons made of paper.