As performed in the real lab
Material Required:
Coloured paper, pencil, a pair of scissors, gum.
Procedure:
- Cut an acute angled triangle from a coloured paper and name it as ABC.
- Form the perpendicular bisector EF of AB using paper-folding method.
- Similarly get the perpendicular bisectors GH and IJ of the sides AC and BC respectively.
- Repeat the activity for right and obtuse angled triangles.
As performed in the simulator
- Select three points A, B and C anywhere on the workbench to draw a triangle.
- Depending on your points selection acute, obtuse or right angled triangle is drawn.
- Now, click on each mid-point to draw their respective perpendicular bisectors. You can use the scale to figure out mid point of each side.
- Activity completed successfully. You can see the inference.
Observations:
- The students see that the three perpendicular bisectors (the three creases obtained) are concurrent.
- For the acute angled triangle, the circumcentre lies inside the triangle as shown in Fig(a).
- For the right angled triangle, the circumcentre is the mid-point of the hypotenuse as shown in Fig(b)
- For the obtuse angled triangle, the circumcentre lies outside the triangle as shown in Fig(c).
Fig (a) Fig (b)
Fig (c)