Polygons

(POLYGONS)

Convex and Concave

Polygon

Grade 7 Mathematics

Week 2 (Day1)

AGENDA

At the end of the period, you are expected to;

1. Classify regular or irregular polygons whether

they are convex or nonconvex;

LESSON

OBJECTIVES:

CONVEX AND CONCAVE

POLYGONS

Short Review

“Shown are common road signs or markings, name the polygon used for each

road signage.”

Lesson Purpose

Convex Polygons: A convex polygon is a polygon where all interior angles are less than 180
degrees, and no vertices point inward. In other words, a line segment drawn between any two points in

the polygon will always lie inside or on the boundary of the polygon.

Non-Convex (Concave) Polygons: A non-convex or concave polygon is a polygon
that has at least one interior angle greater than 180 degrees. This type of polygon has at least one vertex
that points inward, and a line segment drawn between some points within the polygon may pass outside

it.

Examples :

CONVEX POLYGONS

NON-CONVEX POLYGONS

(Concave Polygon)

Activity 1

1. DRAW 2 EXAMPLES OF

CONVEX POLYGONS

2. DRAW 2 EXAMPLES OF NON-

CONVEX POLYGONS

(Convex Polygon)

THANK YOU

DARIOUS F. PABIA

0946-327-1052

[e-mail]