Interactive Display - to clarify Four Center of Triangle (Four center = median, altitude, angle bise

Whats inside

• A geoebra file shows interactively median, altitude, angle bisector, and perpendicular bisector

Why this is useful for student

• Help them to understand how four centers change with the shape of triangle and hence has a better memory about four centers.
  (I found that students commonly mixes up median, altitude, angle bisector, and perpendicular bisector)
• You can show those four centers together (e.g. show median and altitude at the same time) and your students will no longer mix them up.

Why this is useful for you
This file help you to save your time to make material and focus on teaching.

Each feature below takes about 15 to 30 mins to fine tunes. (click here for a version with pictures)

Feature

1. you can show median, altitude, angle bisector, and perpendicular bisector for the same triangle
2. you can drag vertex and show the changes
3. for median, mid point is clearly shown
4. perpendicular bisector, mid point is clearly shown
5. right angle is clearly shown
6. for angle bisector, angles size are clearly shown
7. for altitude, right angle is clearly shown
8. if right angle is outside, a dotted segment is shown