The document discusses the definition and classification of polygons based on their sides, distinguishing between regular and irregular shapes. It includes activities for drawing polygons, naming them according to the number of sides, and comparing polygon congruency. Essential concepts like vertices, sides, and angles of polygons are also covered.

2. 1. Define a polygon.
2. Classify polygon according to its sides and
as regular or irregular.
4. Draw triangles, quadrilaterals and polygons
with 5, 6, 8, or 10 using a ruler, protractor,
and a compass
3. Name, describe, and compare regular and
irregular polygons and polygons
with 5, 6, 8, or 10 sides based on

3. You have 10 seconds to write down the name of the polygon based on the number of sides and what polygon it
reminds you. Correct answers earn 1 point.

4. PLAYERS have 10 seconds to write down the number of sides. Correct answers earn 1 point.
PENTAGON
HEXAGON DECAGON
HEPTAGON
OCTAGON NONAGON

5. Number of Sides Name of Polygon
3 Triangle
4 Quadrilateral
5 Pentagon
6 Hexagon
7 Heptagon
8 Octagon
9 Nonagon
10 Decagon
n n-gon

6. IDENTIFY THE POLYGONS AND NON- POLYGONS ON THE ILLUSTRATIONS. WRITE THE
DEFINITION OR DESCRIPTION OF A POLYGON.

7. They are closed plane figure formed by line
segments that meet at a common point. These
line segments also known as sides meet at a
common point which is called vertex.

9. A polygon that has all
equal sides and angles.
REGULAR POLYGON IRREGULAR POLYGON
A polygon that has
unequal sides and angles.

10. Which figure is a polygon?

11. The figures below are polygons. They are closed, plane figures, made
of line segments, and the segments intersect only at their endpoints.

12. These are not polygons.

13. What is a polygon?
Draw some polygons.

14. For Naming Polygon and its parts:
Polygons may be named based on the
number of sides. You may begin with
the triangle; it has three sides – the
prefix – “tri”. Polygons may be
classified according to the number of
sides.

15. There are prefixes used, Such as tri, quad,
penta, etc.
A polygon is named using its vertices. The vertices are points A, B, and C. So,
the triangle may be called triangle ABC, triangle BCA, or triangle ACB. Sides of
triangle ABC are 𝐴𝐵 ,𝐵𝐶, 𝐴𝐶 Interior angles of triangle ABC are ∠BAC, ∠BCA,
and ∠ABC

16. side
vertex
angle

17. ACTIVITY
Count the number of sides of each polygon and classify what
type of polygon is it based on its number of sides.
1.
Sides: __________
Polygon: ________
2.
Sides: __________
Polygon: ________
3.
Sides: __________
Polygon: ________
4.
Sides: __________
Polygon: ________

18. They are comparison of two alike polygons
with corresponding sides and angles. To
illustrate congruency, it is represented by
the symbol ≅ which means “congruent to”.

19. ≅
A
B
C
D
E F
G
H
I
J
Side Angle
AB ≅ FG
BC ≅ GH
CD ≅ HI
DE ≅ IJ
EA ≅ JF
∠A ≅ ∠F
∠B ≅ ∠G
∠C ≅ ∠H
∠D ≅ ∠I
∠E ≅ ∠J