This document discusses polygons and their properties. It defines a polygon as a closed 2D shape made of three or more straight line segments. Polygons are named based on the number of sides, such as triangles having 3 sides, quadrilaterals having 4 sides, and pentagons having 5 sides. Regular polygons have equal side lengths and equal interior angles, while irregular polygons do not have these properties. The document provides instructions for drawing regular polygons using a protractor and discusses congruent polygons as those with equal corresponding side lengths and angles.

1. Polygons
Q3-WEEK 3

2. Basic Geometric Terms
. Point
Line
Line segment
Ray
Angle
Plane
-is an exact location in space or a flat surface
-is a set of all points that extends infinitely in
both directions
-is a part of the line with two end points
-starts from one point and extend infinitely in
one direction
-is formed when two rays meet at a common endpoint
-is a flat two-dimensional surface that extends
infinitely far

3. Visualizing, Naming,
Describing, and Drawing
Polygons with Five or
More Sides
LESSON 1

4. Polygon
A polygon is a closed 2-dimensional figure made up of
three or more straight line segments.
Each line segment on a polygon is a side. Each corner,
or vertex, of a polygon forms an angle.
3 sides
.
. .
3 vertices
3 angles
TRIANGLE

5. Cross -out which of the following is not a polygon.

6. Polygons are named by the number of sides they have.
Figure Sides, Vertices, Angles Name
3 Triangle
4 Quadrilateral
5 Pentagon
6 Hexagon
7 Heptagon

7. Polygons are named by the number of sides they have.
Figure Sides, Vertices, Angles Name
8 Octagon
9 Nonagon
10 Decagon
11 Undecagon/
Hendecagon
12 Dodecagon

8. Describe how many sides and name of the polygon is being shown.
No. of Sides:_____
Name of the Polygon:_________
No. of Sides:_____
Name of the Polygon:_________
No. of Sides:_____
Name of the Polygon:_________
No. of Sides:_____
Name of the Polygon:_________
No. of Sides:_____
Name of the Polygon:_________

9. Complete the chart by counting the parts for each regular polygon.

10. Describing and Comparing
Properties of Polygons
(Regular and Irregular)
LESSON 2

11. A regular polygon has same length in sides
and same measurement in angles.
Regular
Pentagon
Irregular
Pentagon

12. Regular Polygons Irregular Polygons

13. Visualizing Congruent
Polygons
LESSON 3

14. Two polygons are congruent if their corresponding sides
have equal lengths, and their corresponding angles measure
the same.

15. How to Draw a Regular Polygon Using a Protractor
Materials:
1. Protractor
2. Ruler
3. Pencil

16. How to Draw a Regular Polygon Using a Protractor
1. Draw a straight line using the protractor. This will be the
center line of your circle (dividing it into semi-circles).
Procedures:
2. Align the protractor so that both 0° and 180° lie on the center line.
Mark the center point.
3. Calculate the angle between adjacent vertices, by dividing 360 °
by the number of sides.
4. Mark a point for each of the successive angles.
5. Using the ruler, joint the points marked on the circle with a line
segment
6. Check to see that the sides are the same length. If they are, you
can erase the other marks made to make it now a polygon.
.

17. Draw the congruent polygon of the figure at the left using the grid at the right.

18. MATHtry
Nga!

19. 1. Which among the figures below is an
example of a polygon?
A. L and O
B. O and V
C. L and E
D. V and E
L O V E

20. 2. What polygon is being shown in
the figure?
A. Hexagon
B. Heptagon
C. Nonagon
D. Octagon

21. 3. Look at the figure. If I am inside of a hexagon
but I am not a pentagon, who am I?
A. Hexagon
B. Decagon
C. Heptagon
D. Dodecagon

22. 4. Which of the following figure is not a
regular polygon?
A.
B.
C.
D.

23. 5. Which pair shows congruent polygons?
A.
B.
C.
D.

24. ASYNCHRONOUS ACTIVITY
What I Can Do and Assessment on
pages 8-9 (SLM)