Logic Puzzle: Shape Attributes
Objective:
1. To work cooperatively to solve logic
puzzles involving various shapes
2. To write a paragraph proof using clear
reasoning
Bag of Shapes
Take the
shapes out
of the bag.
What do you
notice
about
them?
Logic Clues
• Look at the set of clues. Basically you are
trying to find a particular shape or pair of
shapes that fit these clues.
• They can be used in any order.
• There are conditional statements (if-then)
and statements of fact.
How should we start?
Logic 2
Use clues in any order:
• If it is yellow, then it is a rhombus.
• If it is large, then it is not blue.
• It is not small.
• If it is large, then it is not green or yellow.
• If it is not green, it is a rhombus.
Procedure
• Work together as a cooperative group,
where everyone contributes and stays
focused, to solve the nine logic puzzles.
• Keep in mind: Do not change your mind
unless you are logically persuaded.
Assignment
Every individual will have to turn in:
• List of your answers for Problems 1-9
• Paragraph proof of ONE problem (1, 3-9)
explaining specifically why your answer(s)
must be true.
Example Proof: Problem 2
Logic problem number 2 refers to a large, red
rhombus. The problem clearly states that the
shape is not small, therefore all small shapes
must be eliminated, leaving only large shapes.
Since our shape must be large, according to two
of the conditional statements, it cannot be blue,
green, or yellow, leaving only red. Finally, since
our shape is not green, it must be a rhombus
according to the last conditional statement.
Therefore, it follows that the shape must be a
large, red rhombus.
Assignment
Every individual will have to turn in:
• List of your answers for Problems 1-9
• Paragraph proof of ONE problem (1, 3-9)
explaining specifically why your answer(s)
must be true.
– You only get this class period to work together
as a group.
– Due next class as 2 quiz grades.
Assignment
Every individual will have to turn in:
• List of your answers for Problems 1-9
• Paragraph proof of ONE problem (1, 3-9)
explaining specifically why your answer(s)
must be true.
– You may have to write stuff down.
– Plagiarism will earn you a zero.
– Shapes and clues can be found online.