User:Georgejem/Origami in Mathematics Pedagogy/Lesson Plans for Upper Primary Classes/Right Angled Triangle

MODEL: ORIGAMI BUTTERFLY edit

 
Crease pattern of origami butterfly
STEP 1: SQUARE SHEET OF PAPER
  • Ask students to describe the shape. (E.g., the square has 4 sides. They are of equal length.)
  • Observe that the adjacent sides are perpendicular. They meet at a point. They meet at right angles.
  • Observe that all angles in the square are 90⁰.
STEP 2: FOLD ALONG ONE DIAGONAL
  • The square is now two triangles. They are right-angled triangles (By above observation)
  • The diagonal is the hypotenuse for both the triangles.
  • They each have a base and a height, here they all happen to be the same. (Why?)
STEP 3: FOLD ALONG THE OTHER DIAGONAL
  • Now there are four more right triangles.
  • Find out where the right angle is.
  • Identify the hypotenuse for each of the triangles.
STEP 4: FOLD ALONG VERTICAL MIDDLE LINE
  • Are there more right triangles formed?
  • Identify the hypotenuse, the base and the height of these triangles.
STEP 5: FOLD ALONG HORIZONTAL MIDDLE LINE
  • Count the total number of right-angled triangles in the paper.

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

Lines(Parallel, Perpendicular, Intersecting) · Angles