Polygons
many-sided
Triangles
Heptagons
Pentagons
3-sided
7-sided
5-sided
(see Triangle
Family Tree)
Quadrilaterals
4-sided
(see Quadrilateral
Family Tree)
Common Core Math: 5.G.B.3, 5.G.B.4
Hexagons
6-sided
Octagons
8-sided
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Triangles
3-sided polygon
Acute
3 acute
angles
Scalene
3 sides of
different
length
Isosceles
at least
2 sides
same length
Obtuse
exactly 1
obtuse angle
Scalene
3 sides of
different
length
Isosceles
at least
2 sides
same length
Right
exactly 1
right angle
Scalene
3 sides of
different
length
Isosceles
at least
2 sides
same length
Equilateral
all 3 sides
are equal
length
Common Core Math: 5.G.B.3, 5.G.B.4
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Quadrilaterals
4-sided polygon
Parallelograms
2 pairs of parallel
sides
Rhombuses
4 equal
sides
Rectangles
4 right
angles
Squares
Non-Parallelograms
1 pair or no pairs of
parallel sides
Trapezoids
1 pair of
opposite
parallel sides
Trapeziums
no parallel
sides
Kites
2 pairs of
adjacent
sides of
equal
length
4 equal sides
4 right angles
Common Core Math: 5.G.B.3, 5.G.B.4
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