Flashcard 5 - Upper Level: Quantitative Reasoning Flashcard Set for the ISEE

Sum = \(180 \cdot (n\; – 2)\), where \(n\) is the number of corners or internal angles.

The sum of all internal angles in a triangle is 180 degrees.

Sum = \(180 \cdot (3 – 2) = 180\).

The same formula works for all polygons.