Curriculum / Math / 3rd Grade / Unit 5: Shapes and Their Perimeter / Lesson 9

Shapes and Their Perimeter

Lesson 9

Math

Unit 5

3rd Grade

Lesson 9 of 16

Objective

Find perimeter of regular polygons and of rectangles when some side lengths are not given.

Lesson Map

Topic A: Attributes of Two-Dimensional Shapes

Lesson

Compare and classify polygons.

Standards

3.G.A.1

Lesson

Compare and classify quadrilaterals.

Standards

3.G.A.1

Lesson

Draw shapes with specified attributes.

Standards

3.G.A.1

Lesson

Reason about composing and decomposing polygons using tangrams.

Standards

3.G.A.1

Topic B: Understanding Perimeter

Lesson

Understand perimeter to be the boundary around a two-dimensional shape. Compare perimeters of various polygons using concrete non-standard units.

Standards

3.MD.D.8

Lesson

Find perimeter of polygons whose sides are marked with unit length marks by counting the unit lengths.

Standards

3.MD.D.8

Lesson

Find perimeter of shapes with all side lengths labeled.

Standards

3.MD.D.8

Lesson

Find perimeter by measuring side lengths in whole number units.

Standards

3.MD.D.8

Lesson

Find perimeter of regular polygons and of rectangles when some side lengths are not given.

Standards

3.MD.D.8

Lesson

Solve word problems involving finding perimeter given the side lengths.

Standards

3.MD.D.8

Lesson

Find side lengths of regular polygons and of rectangles when given perimeter and other side lengths.

Standards

3.MD.D.8

Lesson

Solve more complex word problems involving perimeter, such as finding a missing side length given perimeter and other side lengths.

Standards

3.MD.D.8

Topic C: Distinguishing Between Area and Perimeter

Lesson

Find rectangles with the same area and different perimeters.

Standards

3.MD.D.8

Lesson

Find rectangles with the same perimeter and different areas.

Standards

3.MD.D.8

Lesson

Solve a variety of word problems involving area and perimeter.

Standards

3.MD.D.8

Lesson

Reason about composing and decomposing polygons with various areas and perimeters using tetrominoes.

Standards

3.G.A.13.MD.D.8

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