Lesson PlanThe Greedy Triangle

Second Grade, Common Core Learning Task

Standard:Recognize and draw shapes having specified attributes, such as a given number of angles or a given number of equal faces. Identify triangles, quadrilaterals, pentagons, hexagons, and cubes.

Student Objective Statement:I can identify the different attributes of polygons.I can identify different kinds of polygons based on their attributes.I can create various polygons using different media. I can describe in words what polygons are.

Essential questions: Where do you see polygons? In what ways are polygons used?

Activities & Sequencing:Hook/Engage (5 mins):Think, Pair, & Share: What is a polygon?Create an anchor chart: Using stick notes write down what you think a polygon could be and add it to the class circle map. You can change your mind later.

Sequence of whole group, small group, & Independent work:

1.Set the purpose by asking questions introducing vocabulary slides 4-8 (5-10 mins).

2. Read the story (5-10 mins).

1.Review expectations, small group/partner assignments and mathematical practices. Students break into groups to create shapes using geo-boards (10-15mins).

4.Transition Time - report back to whole group. Think, Pair, & Share: What is a polygon? Make changes to the anchor chart. Add permanent writing. (3-6 mins).

5.Whole group or with partners complete the Polygon Picture Glossary

6. Watch Shape video (5-10 mins)

7.Explore Shapes using “Foldable Glossary” (10mins).8.Close/End of the Day review – Using performance based assessmentsThis can be treated as an exit slip if used for formative assessment. (5-10 mins)

Polygons Polygons

What do you know about polygons?

The Greedy TriangleWritten by Marilyn Burns

• The book The Greedy Triangle• Crayons

• Pencils

• Geoboard

• Smartboard

• Paper from teacher

This story is about a Triangle who wants to be more than just a Triangle. It believes that more angles and corners will make life better. So the Triangle visits the character the Shapeshifter. The Shapeshifter changes the Triangle into many different shapes.

Do you think some shapes are better than others and why?

How will the Shapeshifter change the Triangle into different shapes?

What shapes do you think the Triangle will turn into?

Sides- Sides are the outside lines of a shape.

Angle: the space where two lines meet to make a corner.

Vocabulary

Quadrilateral

Pentagon

Hexagon

A quadrilateral has four sides and four corners. A baseball diamond is the shape of a quadrilateral.

A pentagon has five sides and five corners. Asoccer ball is made up of tiny pentagon shapes.

A hexagon has six sides and six corners. ABee hive cell is the shape of a hexagon.

The next set of vocabulary words I will introduceare quadrilateral, pentagon, and hexagon.

Heptagon

Octagon

Nonagon

Decagon

Vocabulary

A hexagon is a seven sided shape with seven corners. A flower can be in the shape of a hexagon.

An octagon is an eight sided shape with eight corners. A stop sign is the shape of an octagon.

A nonagon is a nine sided shape with ninecorners. The top of a building can be in the shape of a nonagon.

A decagon is a ten sided shape with tencorners. A mirror can be in the shape of a decagon.

Name of the shape Picture of the shape

Number of sides Number of corners

Triangle

Quadrilateral

Pentagon

Hexagon

3 3

4 4

5 5

6 6

CLICKLet’s have some fun reviewing our shapes.

Geoboard Fun!

What is the lesson the triangle learned?

What is the lesson you learned?

Let’s have some fun watching a video about shapes and sizes.CLICK

Let’s have some fun watching a video about shapes and sizes.CLICK

Quick Check:

Formative/Summative Performance Assessment

Formative/Summative Performance Assessment

Burns, M. (1994). The Greedy Triangle. New York: Scholastic

Linehan, Anne (1992). Stretch-It! San Diego: Teaching Resource Center.

http://www.mathsolutions.com/documents/2004_Writing_in_Math.pdf

http://cmc-math.org/family/PDF%20Documents/ExploringPolygons.pdf

http://www.nsa.gov/academia/_files/collected_learning/elementary/geometry/ponder_the_polygon.pdf

Lesson retrieved and altered on April 9, 2013 from: https://docs.google.com/viewer?a=v&q=cache:i_oTLKvibwMJ:www.reading.ccsu.edu/kurkjian/Internet%2520Project/Student

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