1 what is a polygon? a closed figure made by joining line segments each line segment intersects...
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What is a polygon?
a closed figure made by joining line segmentsEach line segment intersects exactly two others.line segments do not intersect
*All images are either original artwork or are used with permission from Microsoft Word and Microsoft Online Design Gallery.
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Are these figures polygons?
yes
yes
no
no
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What is a regular polygon?
A regular polygon is a polygon whose sides are all the same length and whose angles are all the same.
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These are not examples of regular polygons.
The sides are not all the same length.
The angles are not all the same.
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Let’s look at some different kinds of polygons.
triangle What is a three-sided polygon?
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Polygons
parallelogram What is a four-sided figure whose opposite sides are parallel?
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Polygons
rectangle What is a four-sided polygon whose sides and angles are all the same?
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Polygons
square What is a parallelogram or rectangle with four equal sides and angles?
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Polygons
rhombus What is a parallelogram whose sides are all the same length?
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Polygons
trapezoid What is a four-sided polygon having exactly one pair of parallel lines?
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Polygons
pentagon What is a five-sided polygon?
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Polygons
hexagon What is a six-sided pentagon?
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Polygons
heptagon What is a seven-sided pentagon?
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Polygons
octagon What is an eight-sided pentagon?
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Let’s review the polygons we‘ve learned about today.regular polygon
triangleparallelogramrectanglesquarerhombus
trapezoidpentagonhexagonheptagonoctagon
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Can you identify these polygons?
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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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Using your geoboards or dot paper, replicate these polygons.