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→Activity No # External angle property of a triangle
# Repeat for different triangles. What do you infer?
# Repeat for different triangles. What do you infer?
===Activity No # External angle property of a triangle===
===Activity No # 3. External angle property of a triangle===
{| style="height:10px; float:right; align:center;"
{| style="height:10px; float:right; align:center;"
|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">
|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">
* Multimedia resources: Laptop
* Multimedia resources: Laptop
* Website interactives/ links/ Geogebra Applets:
* Website interactives/ links/ Geogebra Applets:
This geogebra file was contributed by Mallikarjun Sudi of Yadgir.
* Process (How to do the activity):
* Process (How to do the activity):
# The teacher can move the 'explain slider' to show how the sum of opposite interior angles equals to external angle.
# The teacher can move the 'explain slider' to show how the sum of opposite interior angles equals to external angle.