User:Georgejem/Origami in Mathematics Pedagogy/Lesson Plans for Upper Primary Classes/Lines(Parallel, Perpendicular, Intersecting)

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MODEL: ORIGAMI BUTTERFLY[edit | edit source]

Crease pattern of making Origami Butterfly


STEP 1: SQUARE SHEET OF PAPER
  • Ask the students to describe the shape. (E.g., the square has 4 sides. They are of equal length.)
  • Observe that the opposite sides are parallel. They do not meet.
  • The adjacent sides are perpendicular. They meet at a point. They meet at right angles.
STEP 2: FOLD THE PAPER IN HALF (HORIZONTALLY)
  • A new line segment is found.
  • This new line is perpendicular to two of the sides. It meets them at a point each, at right angles.
  • Now, there are three line-segments parallel to each other.
STEP 3: FOLD THE PAPER IN HALF (VERTICALLY)
  • This new line is perpendicular to the previous line.
  • It also intersects the previous line. These two lines are called intersecting lines. The point where they intersect is called the point of intersection.
  • Which are the parallel lines here?
  • How many pairs of perpendicular lines can you identify?
STEP 4: FOLD ALONG ONE DIAGONAL
  • This line is neither parallel nor perpendicular to any of the previous, existing lines.
  • It meets the lines from Fold (2) and (3) at the midpoint i.e., it intersects them.
  • These lines are intersecting lines.
STEP 5: FOLD ALONG THE OTHER DIAGONAL
  • Is the new line perpendicular to any of the previous lines?
  • Which are the intersecting lines?
  • What is the point of intersection?

Instructions for completing the Origami Butterfly: https://www.youtube.com/watch?v=cZdO2e8K29o[edit | edit source]

Right Angled Triangle