SubjectPaid lesson
Angles
CT
ClassNotes Team 4 MIN READUPDATED 27 JUN 2026Mathematics J.S.S 2 Third Term
Theme: Mensuration and Geometry
Sub Theme: Shapes
WEEK 4
Angles
Performance Objectives
Students should be able to;
- Find the sum of the angles of a triangle
- Find the sum of angles in a quadrilateral
- Find the sum of the angles in a polygon
Definition of Polygons
Content
Polygon is a closed plane figure bounded by straight lines (edges). 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:
|
No. of sides and angles |
Polygon |
|
|
3 |
Triangle |
|
|
4 |
Quadrilateral |
|
|
5 |
Pentagon |
|
|
6 |
Hexagon |
|
|
7 |
Heptagon |
|
|
8 |
Octagon |
|
|
9 |
Nonagon |
|
|
… |