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Guess My Rule
Alignment Lesson
Day 42
Let’s Review Triangles
The Triangle Song
Perpendicular lines
intersect or meet to
form right angles
Parallel lines
always are the same
distance apart and
never touch
Equilateral
triangle
An equilateral triangle has
all congruent sides
Isosceles
triangle
An isosceles triangle has all
at least two congruent sides
Vocabulary Review
• Quadrilateral - a polygon with four sides
Vocabulary Review
• Parallelogram - a polygon with two pairs of
parallel sides
• A rectangle is a parallelogram
• A rhombus is a parallelogram
• A square is a parallelogram
Vocabulary Review
• Square - a parallelogram with all sides the
same length and all right angles
– Diagonals are congruent
– Diagonals are perpendicular
– A quadrilateral
Vocabulary Review
• Rectangle - a parallelogram with all right
angles
– Diagonals are congruent
– Opposite sides are congruent
Vocabulary Review
• Rhombus - a parallelogram with all sides the
same length
• Diagonals are NOT congruent
• Diagonals are perpendicular
Vocabulary Review
• Trapezoid – a quadrilateral with ONLY one pair
of parallel sides
• Right trapezoid - a trapezoid with right angles
Vocabulary Review
• Pentagon - a polygon with five sides
Vocabulary Review
• Hexagon - a polygon with six sides
Vocabulary Review
• Octagon – a polygon with eight sides
Vocabulary Review
• Kite - A quadrilateral with two distinct pairs of
congruent, adjacent sides and diagonals that
intersect at a right angle.
What are ways to classify triangles?
Scalene
Classify by the
length of their
sides
Isosceles
Equilateral
Triangles
Acute
Classify by the
measure of the
angles
Right
Obtuse
Which types of quadrilaterals can be
classified as parallelograms?
• Square
• Rectangle
• Rhombus
• Is a trapezoid a parallelogram? Why or why
not?
• NO!!! A trapezoid is not a parallelogram because it
only has ONE PAIR of PARALLEL SIDES!
• What are the characteristics of a regular
polygon?
• All angles are congruent!
• All sides are congruent!
Guess My Rule
• Find Day 42, “Guess My Rule Shapes”
• Quickly cut out the shapes
• Watch as I model a game of Guess my Rule
Guess My Rule
• Purpose: Your goal is to have your partner guess your “rules” by
naming shape numbers that fit into each side (or the middle) of a
Venn diagram.
• Think of two different characteristics of shapes. These
characteristics will become your imaginary “rules”.
• Place a few shapes in each side or the middle of the diagram
according to your rules.
• Keep adding shapes on the diagram until your partner thinks
he/she is ready to try and place a shape him/herself correctly
in the diagram.
• If your partner thinks he/she knows the rule, prove it only by
naming a shape that fits the rule and not by telling the rule.
• Don’t reveal your rules until all shapes have been sorted
correctly!
Math Talk
• Let’s discuss the “sorts” you created today.
• As you explain your sorts, use the math
vocabulary we have discussed.
Word Bank of Math Vocabulary
Right Angle
Obtuse Angle
Acute Angle
Triangle
Scalene Triangle
Isosceles Triangle
Acute Triangle
Quadrilateral
Square
Trapezoid
Parallelogram
Rectangle
Rhombus
Kite
Hexagon
Octagon
Perpendicular
Parallel
Sides
Equilateral Triangle
Pentagon
Adjacent
Angle
Diagonals
Congruent
Homework
Day 42, “Guess My Rule
Journal Prompt”

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