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From Karnataka Open Educational Resources
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, 07:10, 26 December 2013
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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.''] |