Download Geometric measurement: recognize perimeter as an attribute of

Day 10: Geometry Assessment and Perimeter Problems
Cluster:
Emphasized Standards for Mathematical
Geometric measurement: recognize perimeter as an attribute of
Practice:
plane figures and distinguish between linear and area measures.
3. Construct viable arguments and critique the
3.MD.8 Solve real world and mathematical problems involving
reasoning of others
perimeters of polygons, including finding the perimeter given the
4. Model with mathematics
side lengths, finding an unknown side length, and exhibiting
6. Attend to precision.
rectangles with the same perimeter and different areas or with the
7. Look for and make use of structure.
same area and different perimeters.
Mathematical Goal:
Students will solve real-world and complex geometric perimeter
problems by applying geometric and measurement concepts.
Materials:
Perimeter Problems- 1 copy of each for each partner pair.
(Remember, these lessons are an introduction into perimeter More work with perimeter will come later in the year.)
Words that you should hear students using in
mathematical conversations:
Polygons perimeter a ttribute
sides
sum
length
triangle, quadrilateral, pentagon, hexagon, octagon,
Ten Minute Math:
None today
Before:
Have students get into pairs and solve the 4 perimeter puzzler problems. Remember, more work with perimeter will come
later in the year.
During:
Students solve Perimeter Challenge Problems with a partner (find missing sides and the perimeter when it is not given).
Give students time to complete the geometry assessment independently (approximately 25 minutes).
After:
Have students share strategies for solving some of the Perimeter Challenge Problems. Focus on how students used
understanding of measuring perimeter and knowledge about shapes to solve each of the problems.
Evaluation: Geometry-Assessment
3rd Grade Geometry Mini-Assessment
Name:__________________________.
1. Complete the table below
Which shapes above
Which shapes above
belong to the group “all
belongs to the group “all
sides are the same length?” sides are different
lengths?”
Which shapes above have
OPPOSITE sides that are the
same length?
2. Find a shape in the table above that appears in more than 2 categories. Justify why that
shape belongs in both of the categories.
3. Complete this sentence; the shapes above are all __________________________________
because_____________________________________________________________________
4. Draw 2 examples for each category in the table below.
Square
Rhombus
Rectangle
A quadrilateral that is NOT a square,
rhombus, or rectangle.
5. Gwen says that ALL rectangles belong in the group “some square corners.” Lea says that all
rectangles belong in the group “all square corners.” Who is correct AND WHY?
6. Which attributes do rhombuses and squares have in common (Use the list of attributes in the Attribute
bank)
Attribute Bank
All sides that are the same length (congruent)
2 sides the same length
4 square corners
4 sides and 4 angles
All angles are congruent (the same)
2 angles are the same
PERIMETER PUZZLERS #1
Adam walked across the front of a square-shaped yard. He
walked 36 feet. If Adam were to walk the perimeter of the yard,
how far would he walk? Explain how you know.
PERIMETER PUZZLERS #2
All of the short sides on this figure are the same length. What is
the perimeter of this figure?
25 cm
PERIMETER PUZZLERS #3
The perimeter of this rectangle is 68 units. What is the
length of the unlabeled sides?
50 units
_____
Units
_____
units
50 units
PERIMETER PUZZLERS #4
I am a quadrilateral with four square corners (right angles). All of
my sides are 8 units long.
Draw the shape and label the length of each side.
What’s my shape called:____________
What’s my perimeter? _____________
Name:______________________
ADDITIONAL RESOURCES YOU MAY WANT TO INCORPORATE INTO THIS UNIT:
Square Disguise Exit Ticket
This shape thinks she looks just like a parallelogram.
What are the attributes of a parallelogram?
Do you agree that this shape is a parallelogram?
Name:______________________
Square Disguise Exit Ticket
This shape thinks she looks just like a parallelogram.
What are the attributes of a parallelogram?
Do you agree that this shape is a parallelogram?
Name:_________________________