Chapter 15 Lesson 3 Quadrilaterals and Other Polygons.
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Transcript of Chapter 15 Lesson 3 Quadrilaterals and Other Polygons.
![Page 1: Chapter 15 Lesson 3 Quadrilaterals and Other Polygons.](https://reader035.fdocuments.in/reader035/viewer/2022081503/56649eb05503460f94bb5d23/html5/thumbnails/1.jpg)
Chapter 15 Lesson 3Chapter 15 Lesson 3
QuadrilateralsQuadrilaterals
and Other Polygonsand Other Polygons
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A A polygonpolygon
is a flat, closed figure that is made up of is a flat, closed figure that is made up of three or more straight line segments called three or more straight line segments called sides sides . .
FLATFLAT CLOSEDCLOSED 3 or MORE STRAIGHT SIDES3 or MORE STRAIGHT SIDES
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A A vertexvertex
is the point where two sides of a polygon is the point where two sides of a polygon meet.meet.
Show me a Show me a vertexvertex! ! Hint- Remember the Very, Very Tickly spot?Hint- Remember the Very, Very Tickly spot?
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A polygon can be named by the number of sides it has.
These Are Polygons:
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TriangleTriangle“tri” means 3“tri” means 3
3 sides3 sides 3 angles3 angles
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QuadrilateralQuadrilateral“quad” means 4“quad” means 4
4 sides4 sides 4 angles4 angles
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PentagonPentagon“pent” means 5“pent” means 5
5 sides5 sides 5 angles5 angles
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HexagonHexagon“hex” means 6“hex” means 6
6 sides6 sides 6 angles6 angles
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OctagonOctagon“octo” means 8“octo” means 8
8 sides8 sides 8 angles8 angles
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These Are These Are Not Not PolygonsPolygons::Can you tell me why?Can you tell me why?
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Some QuadrilateralsHave Special Names
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A A rectanglerectangle
has opposite sides that are parallel has opposite sides that are parallel four right angles.four right angles.
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A A squaresquare
has four sides of the same length has four sides of the same length four right anglesfour right angles
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A A trapezoidtrapezoid
has only one pair of parallel sides.has only one pair of parallel sides.
What does that sound like? TRAP reminds me of a trap that What does that sound like? TRAP reminds me of a trap that gets skinnier and skinnier as you go in! Then, POOF! You gets skinnier and skinnier as you go in! Then, POOF! You are trapped!are trapped!
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A A parallelogramparallelogram
has opposite sides that are parallel.has opposite sides that are parallel.
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A A rhombusrhombus
has opposite sides parallel has opposite sides parallel four sides of the same lengthfour sides of the same length..
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Quadrilateral GameQuadrilateral Game
Each student needs to get one Each student needs to get one dice, a pencil, and a piece of dice, a pencil, and a piece of
paper. paper.
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You and the person across from You and the person across from you are partners. If we have a you are partners. If we have a
group of 3, that is fine too!group of 3, that is fine too!
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Take turns rolling the diceTake turns rolling the diceand name the figure that has that and name the figure that has that
many sides.many sides.
((1 and 2 rolls do NOT make quadrilaterals. Skip to 1 and 2 rolls do NOT make quadrilaterals. Skip to the next player.)the next player.)
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See how many you can quietly See how many you can quietly get right in the next 2 minutes.get right in the next 2 minutes.
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