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# The angles inside the triangle are its interior angles.
# The angles inside the triangle are its interior angles.
# The sum of all 3 interior angles in any triangle is always 180 degrees which is called the angle sum property of a triangle.
# The sum of all 3 interior angles in any triangle is always 180 degrees which is called the angle sum property of a triangle.
+# The external angle of a triangle is always equal to the sum of its two opposite interior angles.
+
===Notes for teachers===
===Notes for teachers===
[''These are short notes that the teacher wants to share about the concept, any locally relevant information, specific instructions on what kind of methodology used and common misconceptions/mistakes.'']
[''These are short notes that the teacher wants to share about the concept, any locally relevant information, specific instructions on what kind of methodology used and common misconceptions/mistakes.'']