polygons. building polygons we use line segments to build polygons. a polygon is a closed shape with...
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POLYGONS
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BUILDING POLYGONS
We use line segments to build polygons.
A polygon is a closed shape with straight sides.
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POLYGON NOT A POLYGON
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POLYGONS
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POLYGONS
Polygons may also be called 2D shapes or PLANE
FIGURES. A PLANE is a flat surface. PLANE figures are flat, not solid or 3D.
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Is it a polygon?
U
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ATTRIBUTES are characteristics or traits of a polygon or shape, such as:
•The number of sides•The number of angles (corners)•The length of sides•The number of right angles
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Compare and contrast.What attributes are the same? What are different?
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triangle
rectangle
square
Some polygons have special names.
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quadrilateral
pentagon
hexagon
octagon
Some polygons have special names.
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triangle
rectangle square
Let’s take a closer look at some special shapes.
circleAre they all polygons?
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What letter is inside the circle and the triangle?
What letter is inside the rectangle but NOT in the circle?
What letters are inside the triangle but outside the square?
A BC
D
EF
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triangle
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rectangle
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square
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circle
A circle is a PLANE (flat) figure but not a polygon. It does not have straight sides.