Two Dimensional ShapesUnit of Study 10: Geometry and FractionsGlobal Concept Guide: 2 of 3

Content Development

Focus should be on the attributes that make up the shape with a focus on precise vocabulary.When introducing angles to students, discuss the importance of angles in building things for example the angle of a stair makes it flat so we can stand on it.Exposing students to how shapes can be composed and decomposed will lay the foundation for fractions. For more information on plane shapes, click here

Content Development

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Day 1 Essential Question: How can you name a shape based on its number of sides

and vertices? Possible Engage:

Provide students anglegs (or other line segments-toothpicks, straws, pretzel sticks, etc.).

Instruct students to use anglegs to create a three-sided shape. Discuss the attributes of the shape (three line segments, 3 vertices). Instruct students to create a four-sided shape. Allot ample time for discussion as

students could make a variety of quadrilaterals (rectangles, squares, trapezoids, etc.) Based on the standards, students are NOT required to classify quadrilaterals.

Students should continue to make shapes with their anglegs including five-sided shapes (pentagon) and six-sided shapes (hexagon).

As students create the shapes focus on the attributes of sides and angles. Shape Up (pg. 125 and 127) can be used on Day 1 to help students solidify

their understanding of identifying shapes based on sides and vertices. Elements of Go Math lesson 11.3 may be used on this day to help students

make the connection between sides and vertices identifying specific shapes.

Day 1 continued Additional Options: Create riddles and have students create shape with

anglegs or on geoboard.

Mega Math- Identify Plane Shapes By the end of Day 1, students will be able to name 2-dimensional shapes

based on the attributes of sides and vertices.

Day 2 Essential Question: How do you find and count angles in two dimensional shapes? Possible engage:

Provide students anglegs (or other line segments-toothpicks, straws, pretzel sticks, etc.) Anglegs would be ideal for this engage.

Have students create a shape with 3 sides. Identify the vertex and angle within the shape. Facilitate discussion as to how many angles the shape has.

Repeat the task so that students create 4-sided, 5-sided and 6-sided shapes.

Go Math lesson 11.4 may be used on this day to help students find and count angles in a shape.

Geo boards would be great to use on this day to help students count angles on the board. Pattern blocks can also be given to students to help them count angles. The focus of today is angles; however, you may still want to ask students to identify the

number of sides and vertices for each shape. By the end of Day 2, students will be identify shapes based on the number of angles.

vertex

angle

Day 3 Essential Question: How can you use the number of sides and angles to sort

two-dimensional shapes? The focus of today is to sort shapes into categories based on attributes such as

sides and angles.

Provide each group of students a set of pattern blocks. Have students' sort the pattern blocks into categories based on attributes.

Facilitate a discussion about why students chose to sort their pattern blocks into the categories they chose.

Day 3Farm Fences can be used on this day. Students have to create shapes based on specific criteria.

Mega Math- Sort Plane Shapes Elements of Go Math lesson 11.5 may also be used to supplement instruction

on this day. By the end of Day 3, students will be able to sort shapes based on sides and

angles.

Day 4 Essential Question: What are different ways to sort polygons?

Provide students with Polygon sort cards. Have students sort shapes based on attributes. The students need to identify the rule for the way that they sorted their shapes. Facilitate discussions about the ways students sorted their polygons.

The Shape Riddles lesson could be used on this day. The activity has students create polygons from riddles.

It’s All About the Shapes –Cpalms lesson using The Greedy Triangle, geoboards, concentration game and a Venn diagram can be used on Day 4.

By the end of Day 4, students will be able to use attributes of polygons to sort shapes.

Enrich/Reteach/Intervention

Reteach: RtI Tier 2 TE p. 521B RtI Tier 2 Tier 2 TE p. 525B Reteach p. R101 Reteach p. R102 Reteach p. R103 Animated Model- Identify Plane Figures Animated Model- Sort Plane Figures

Enrich: Enrich Activity on TE p. 517B, 521B, 525B What’s my Shape Task: Use the Polygon sort cards . Assign one

student in the group/pair to be the leader. Give the leader a “secret card”. The other player(s) ask yes or no questions to the leader to determine the secret shape on the secret card.

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