Students will analyze characteristics of geometric shapes.
- The Shape of Things, by Dayle Ann Dodds; ISBN 0-439-13666-0
- Pattern Block City!, by the Editors of Planet Dexter (Scholastic);
- Circus Shapes, by Stuart J. Murphy; ISBN 0064467139
- The Greedy Triangle, by Marilyn Burns; ISBN 0590489917
- Cat Show, by Jayne Harvey; ISBN 044843112-2
Background for Teachers
Students will analyze characteristics of geometric shapes. Students
need to know the defining attributes (and other attributes that are
consequences of the definitions) of a circle, square, triangle and rectangle
prior to this lesson.
Polygon—A closed plane figure made by line segments
Circle—A closed curve with all its points in one plane and the same
distance from a fixed point.
Triangle—A polygon with three sides (additional attributes: three
Square—A quadrilateral (four-sided polygon) with four congruent
sides and four right angles.
Rectangle—A quadrilateral with two pair of congruent parallel sides
and four right angles (additional attributes: two pair of parallel
sides, two pair of congruent sides).
Note: A rectangle does not necessarily have two short and two long
sides! A square is a special rectangle!
Students need to experience the shapes by touching, seeing, and
discussing the number of sides and/or corners of each with peers or the
whole class. Students should be given many opportunities to find shapes
in their environment. Last, using definitions from class, students find an
object in their environment and communicate why it is like the shape of
their choice and not like another shape.
Intended Learning Outcomes
5. Understand and use basic concepts and skills.
6. Communicate clearly in oral, artistic, written and nonverbal form.
Invitation to Learn
- I spy something that is large and has four sides and four corners.
This object can be used to write on or hang pictures on. What is
- I spy something that has no sides and no corners but it does have
hands. What is it? (clock)
- Teach one of the shape songs.
- Have students choose a shape and identify it by describing its
- Individually or with a partner, students will walk around the
classroom or school (if appropriate) and compare their given
shape to an object in their surrounding.
- Students will place the shape on top of an object to make sure
they match. They can leave it taped to the object if in own
- Using the Same and Different worksheet, students will
draw a picture of the object chosen to represent their shapes.
Next they will write or fill in the blanks as to how it is the same
and how it is different from another shape.
Listening Activity: Have children:
- Color the circle red
- Color the triangle blue
- Color the square orange
- Color the rectangle yellow
- Name objects that look like these shapes
Critical Thinking Skills: Can you think of an object that has more
than one shape?
Shape Riddles: Let your imagination go!
- I have no corners.
I have no sides.
What am I?
- I have three sides.
I have three corners.
What am I?
- Students should explain the definition of each shape to a parent or
family member. Then challenge that family member to find a
shape around the house to compare. Tell why it is alike and why
it is different from another shape. The student should be the "teacher" and check to see if their family member is correct.
- Student could draw a picture of the item and write a simple
sentence explaining what shape was used (e.g., "The door is like a
rectangle. It has four sides and four corners. It is not like a
triangle because it has more than three sides and three corners.").
- Observe students as they describe their shapes.
- Use student work page.
- Pull small groups aside and hold up a shape and have them name.