The purpose of this lesson is for students to identify attributes that distinguish polygons and use geometric language to describe polygons.
The lesson proceeds by asking students to solve several Geoboard riddles. The riddles are as follows:
• It has 3 sides. Each side is a different length. It has one interior peg. It has no right angles.
• It has 4 sides. It has only one pair of parallel sides. No sides are the same length, or congruent.
• It has 6 sides. It has an area of 5 square units. It has 2 right angles.
Students then work in pairs as they try to come up with solutions for each of the riddles, examining different geometric properties as they proceed towards a solution. Solutions are presented to the class along with rationale for creating the particular solution. The lesson can be extended asking students to create their own riddles.
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