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From Karnataka Open Educational Resources
→Concept #2. Properties and measurements of polygons
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# Each exterior angle must be <math>360/n</math>
# Each exterior angle must be <math>360/n</math>
# Each of the exterior angle and interior angles are measured from the same line. hence they add upto 180 degrees.
# Each of the exterior angle and interior angles are measured from the same line. hence they add upto 180 degrees.
−# Area of Polygon = perimeter × apothem / 2 [[File:Apothem.jpeg|100px]]
+# Area of Polygon = perimeter × apothem / 2 [[File:Apothem.jpeg|150px]]
