MODEL: ORIGAMI BUTTERFLY
edit
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.
|
← Lines(Parallel, Perpendicular, Intersecting) · Angles →