Lesson 19 Polygons Kalyani David. 1.Define polygon 2.Identify and describe polygons by the number of...
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Transcript of Lesson 19 Polygons Kalyani David. 1.Define polygon 2.Identify and describe polygons by the number of...
![Page 1: Lesson 19 Polygons Kalyani David. 1.Define polygon 2.Identify and describe polygons by the number of sides and angles 3. Explain the difference between.](https://reader030.fdocuments.net/reader030/viewer/2022032600/56649db45503460f94aa4bed/html5/thumbnails/1.jpg)
Lesson 19 Polygons
Kalyani David
![Page 2: Lesson 19 Polygons Kalyani David. 1.Define polygon 2.Identify and describe polygons by the number of sides and angles 3. Explain the difference between.](https://reader030.fdocuments.net/reader030/viewer/2022032600/56649db45503460f94aa4bed/html5/thumbnails/2.jpg)
1. Define polygon2. Identify and describe polygons by the number of sides and angles3. Explain the difference between regular and irregular polygons
Objective
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What is a Polygon????
Any ideas?
Write down what you think it is for
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a closed figure with three or more sides.
A polygon is…
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A polygon is a closed figure
with 3 or more sides
(all straight lines, no curves).
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Check your work
Polygon Not a polygonNot a polygon polygon
Polygon Not a polygonpolygon
Not a polygon
![Page 7: Lesson 19 Polygons Kalyani David. 1.Define polygon 2.Identify and describe polygons by the number of sides and angles 3. Explain the difference between.](https://reader030.fdocuments.net/reader030/viewer/2022032600/56649db45503460f94aa4bed/html5/thumbnails/7.jpg)
Check your work
Polygon polygon polygon Not a polygon
Polygon Not a polygonNot a polygon Polygon
![Page 8: Lesson 19 Polygons Kalyani David. 1.Define polygon 2.Identify and describe polygons by the number of sides and angles 3. Explain the difference between.](https://reader030.fdocuments.net/reader030/viewer/2022032600/56649db45503460f94aa4bed/html5/thumbnails/8.jpg)
Essential Question
Where do we see Polygons in our everyday Environment ?
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Classifying Polygons
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Triangle A triangle has three sides.
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Quadrilateral A Quadrilateral has four sides.
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Pentagon A pentagon has five sides.
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Hexagon
A hexagon has six sides.
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Heptagon
A heptagon has seven sides.
heptagon
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Octagon
An octagon has eight sides.
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8 sided Polygon = Octagon
Hint: “oct”opus – 8 legs
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Number of Sides Name
3 Triangle
4 Quadrilateral
5 Pentagon
6 Hexagon
7 Heptagon
8 Octagon
9 Nonagon
10 Decagon
11 Hendecagon
12 Dodecagon
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Classifying Polygons by
number of Sides
Q: What do we call a polygon with more than 12 sides?
A : An ‘n’-gon where ‘n’ is the number of sides
Ex: a 20 sided polygon is a 20-gon
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Let’s Review:
The triangle is the smallest polygon. It only has three sides.
A pentagon has five sides. A hexagon has six sides. A heptagon has seven sides. An octagon has eight sides.
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Match these.
Triangle eight sides
Heptagon three sides
Octagon seven sides
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Match some more.
Pentagon four sides
Hexagon five sides
Square six sides
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A triangle is the smallest polygon because it has three sides. Can you have a two-sided polygon? Why or why not?
Two lines don’t close to make a shape. They make an angle.
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Key Question:
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Practice set and Written Practicefrom your Text
Page:123
Home Work