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UNIT PLAN
Grade Level:
Unit #:
Unit Name:
3
3-3
Geometry-Polygons
Big Idea/Theme: The physical world can be described by understanding the
connection between the identification of basic attributes and the classification of
two-dimensional shapes.
Culminating Assessment:
Create a picture that includes at least one example of each of the following
polygons:
Triangles (isosceles, scalene, equilateral, obtuse, acute, right).
Quadrilaterals.
Pentagons.
Hexagons.
Octagons.
Choose a color to represent each polygon.
Include a key to classify the polygons by color.
Unit Understanding(s)
Students will understand that…
Polygons can be classified as
triangles, quadrilaterals,
pentagons, hexagons, or
octagons according to the
number of their sides.
Triangles can be classified by
the length of their sides as
scalene, isosceles, or
equilateral.
Triangles can be classified by
the sizes of their angles as
acute, obtuse, or right.
Unit Essential Question(s):
How are polygons classified?
How are triangles classified as
scalene, isosceles, or
equilateral?
How are triangles classified as
acute, obtuse, or right?
Students will know… / Students will be able to…
• Explain that an equilateral triangle is a triangle with three equal sides and
three equal angles.
• Recognize that an isosceles triangle has two equal sides and opposite
angles are equal.
• Identify a scalene triangle as having no equal sides and no equal angles.
• Recall that an acute angle is smaller than a right angle.
• Recall that a right angle measures 90º and can be shaped like an L.
• Recall that an obtuse angle is larger than a right angle.
• Classify triangles by the length of their sides as scalene, isosceles, or
equilateral according and by the sizes of their angles as acute, right, or
obtuse.
• Classify triangles by the length of their sides as scalene, isosceles, or
equilateral according to the sizes of their angles as acute, right, or obtuse
to solve increasingly more sophisticated problems.
South Carolina Academic Standards:
3-4.2 Classify polygons as either triangles, quadrilaterals, pentagons,
hexagons or octagons according to the number of their sides.
3-4.5 Classify triangles by the length of their sides as scalene, isosceles,
or equilateral according and by the sizes of their angles as acute,
right, or obtuse.
Vocabulary:
Acute angle
Analyze
Angle
Attribute
Congruent
Degrees
Equilateral
Heptagon
Hexagon
Intersecting
Isosceles
Line segment
Obtuse angle
Octagon
Parallel lines
Parallelogram
Pentagon
Perpendicular
Polygon
Quadrilateral
Rectangle
Rhombus
Right angle
Scalene
Square
Three dimensional shape
Trapezoid
Triangle
Two dimensional shape
Interim Assessment (formative)
Classroom assignments
Graphic organizers
Homework
Individual and group activities/work
Math journals
Quizzes
Section tests
Observation
Rock, Paper, Scissors
Response Cards
Draw two names
ActiVotes
Key Criteria (to meet the standard/rubric)
Rubric Below
Geometry 3-3 Culminating Assessment Rubric
4
3
Picture includes 8
out of 10 required
elements.
2
1
Picture includes 6
out of 10 required
elements.
Picture includes 5
or fewer elements.
Color
Chose a color for
each polygon.
Key
Creates a key to
classify each
polygon by color.
Did not choose a
color for each
polygon.
Does not create a
key to classify
polygons by color.
Picture
Picture includes at
least one example of
each of the following:
triangles (isosceles,
scalene, equilateral,
obtuse, acute, and
right), quadrilaterals,
pentagons, hexagons,
and octagons.