National mathematics program WEEK2.slide

National Mathematics Program week 2 slideshare

1. National mathematics program QUARTER 1

2. CLASSIFICATION OF POLYGONS ACCORDING TO THE NUMBER OF SIDES WHETHER REGULAR OR IRREGULAR

3. ( Polygon)

4. (Not a Polygon )

5. (Not a Polygon )

6. (Polygon )

7. (Polygon )

8. (Polygon )

9. (Not a Polygon )

10. (Not a Polygon )

11. Things to remember Non-collinear - points that do not lie on the same straight line Polygon - literally means “many angles” in Greek Interior Angle- angle inside the polygon Edges – sides of the polygon Irregular polygon – does not have all sides and angles of equal measure Regular polygon – has equal sides and equal angles N- gon – has n-sides Dodecagon - has 12 sides Undecagon – has 11 sides

12. 3 TRIANGLE REGULAR 6 HEXAGON IRREGULAR QUADRILATERAL 4 IRREGULAR 6 HEXAGON IRREGULAR 4 QUADRILATERAL REGULAR

13. REGULAR POLYGON When can you say that a polygon is regular or irregular? A polygon is regular if the measurements of its sides and angles are congruent. If not, then it is irregular.

14. 1. Penta comes from the Greek word " pente ,” which means "five." 2 . Hexa comes from the Greek word "hex," which means "six." 3 . Octa comes from the Greek word " okto ," which means "eight." 4 . Deca comes from the Greek word " deka ," which means "ten.”

15. Directions: Classify/name the polygon being described. 1. I am a six- sided polygon. All my sides are equal and angles are equal. Regular hexagon 2 . I am a polygon with six sides. Hexagon 3 . I am a five- sided polygon. Five sides and five angles are equal. Regular pentagon 4 . I am a polygon with five sides. Pentagon 5 . I am a polygon with ten sides. Ten sides and ten angles are equal. Regular decagon

16. PROPERTIES OF REGULAR AND IRREGULAR POLYGONS To measure an object using a ruler, line up the end of an object to the zero of the ruler then look at the other end of an object and get the length measure.

17. To measure an angle using a protractor, line up the vertex of the angle with the dot at the center of the protractor. Line up one side of the angle with 0 degrees on the protractor. Read the protractor to see where the other side of the angle crosses the number scale.

18. Compass - It is an instrument, usually metal, that you can use to draw circles or arcs, and to measure distances for constructions in geometry. Protractor - It is an instrument for measuring angles . Interior angles - These are angles formed by two consecutive sides inside a polygon . Degree - It is a unit of angular measurement used to quantify the size or magnitude of an angle . Vertex - It is a point where two straight lines or rays meet.