Area of Plane Figures

Videos, examples, solutions, and lessons to help Grade 3 students learn how to understand area as an attribute of plane figures.

Common Core Standards: 3.MD.5, 3.MD.6, 3.MD.7

New York State Common Core Math Module 4, Grade 3, Lesson 1

Application Problem
Eric makes a shape with 8 trapezoid pattern blocks. Brock makes the same shape using triangle pattern blocks. It takes 3 triangles to make 1 trapezoid. How many triangle pattern blocks does Brock use?

Note: This problem reviews the Grade 3–Module 3 concept of multiplying using units of 8.

Concept Development
Part 1: Using pattern blocks to understand area.
Part 2: Measuring area using square units.

Lesson 1 Homework

1. Magnus covers the same shape with triangles, rhombuses, and trapezoids
   a. How many triangles will it take to cover the shape?
   b. How many rhombuses will it take to cover the shape?
   c. Magnus notices that 3 triangles from Part (a) cover 1 trapezoid. How many trapezoids will it take to cover the shape below? Explain your answer.
2. Angela uses squares to find the area of a rectangle. Her work is shown below.
   a. How many squares did she use to cover the rectangle?
   b. What is the area of the rectangle in square units? Explain how you found your answer.

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