1. Definition of Polygons
  2. Types Of Polygons
  3. Sum of Interior Angles in a Polygon
  4. Sum of Exterior Angles in a Polygon


Definition of Polygons

A closed plane figure bounded by straight lines (edges) is called a polygon. The number of sides of a polygon determines its names. The table below describes the names of polygons according to the number of their sides:


Types Of Polygons

1. Convex Polygon:

A convex polygon has all its interior angles pointing outwards. No angle is pointing inwards. Each internal angle of a convex polygon is always less than 1800. A polygon is convex if any line segment joining any two points on it stays inside the polygon itself. Examples of convex polygons are shown below:

Angles in a polygon - Convex angles

2. Concave (Re-entrant) Polygon:

If there is any internal angle greater than 180°, the angle points inwards and the polygon becomes concave.

Lesson tags: JSS2 Mathematics, JSS2 Mathematics Evaluation Questions, JSS2 Mathematics Evaluation Questions Third Term, JSS2 Mathematics Objective Questions, JSS2 Mathematics Objective Questions Third Term, JSS2 Mathematics Third Term, Mathematics Lesson Notes, Mathematics Objective Questions
Back to: Mathematics – JSS2 (Upper Basic 8) > Third Term
© [2022] Spidaworks Digital - All rights reserved.