Perpendicular and parallel straight lines 2 2/2
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Perpendicular and parallel straight lines 2 2/2
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Have your measuring tool and folded sheet from the previous lesson. Choose a sheet of origami paper.
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An additional sheet should be given at the end of the lesson.
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Question: What is special about the two pairs of sides of the square which have a common vertex?
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Answer: Adjacent sides are perpendicular to each other and form a right angle.
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Folding instructions:
Fold the shorter side as shown.
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Check that the correct folding has been done not revealing the white side.
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Folding instructions: Fold again the shorter side of your shape as shown.
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The last two folding instructions must be checked carefully.
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Folding instructions: Turn over your folded shape.
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Check this folding instruction done by all the pupils.
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Folding instructions: Join the two opposite sides to the line of symmetry as shown.
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Folding insructions: Flatten your shape and then fold two triangles as shown.
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All folding must be done on a flat surface.
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Folding instructions: Fold the other two vertices as shown.
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The size and exactness of the folds is not important.
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Folding instructions: Turn over your shape.
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Show your turned over shape to all of the pupils.
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Folding instructions: The next folds are on the upper part of the shape.
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Folding instructions: Fold the two vertices as shown.
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Finally the dress!
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A summing up question: What can be noticed with each pair of orange colored lines?
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A summing up question: What can be noticed about the two lines shown in the animation? How can you check?
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A summing up question: Can you find other pairs of perpendicular lines and pairs that are not perpendicular?
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Answer 1:
A pair of non perperdicular lines can be seen as they do not form a right angle.
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Answer 2:
A pair of intersecting lines that are not perpendicular can be seen.
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Choose another sheet of origami paper.
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Folding instructions: Make 4 folds on this new sheet in any way you choose.
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Check how many pairs of intersecting lines are perpendicular to each other.
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Activity: Draw a line which is parallel to the given red line. How can we check that this line is parallel to the red line?
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If the slide with the red line is projected on a whiteboard pupils can be asked to draw a suitable line which is parallel to the red line and also another line which is perpendicular to the red line.
This activity can also be done in a workbook.
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Activity: Draw a line which is perpendicular to the red line.
- Lesson Aims
During the folding process the pupils will identify parallel and perpendicular lines.
- Name of Model
A dress.
- The Lesson Structure
According to the curriculum.
- Lesson content
This is the second lesson on parallel and perpendicular lines following the prepatory lesson on parallel and perpendicular lines-1 1/2. In this lesson will identify aparallel and perpendicular lines in other situations. The final model will be a surprise for the pupils and at the same time learning new concepts and revising previously learnt concepts.
- Prior Knowledge
The concepts of angle,straight angle and square.
- Materials
Origami sheets 15/15 cm, the measuring tool and two colored markers.
