# Lesson 4

Attributes of Rectangles, Rhombuses, and Squares

### Lesson Purpose

The purpose of this lesson is for students to consider the geometric attributes a quadrilateral must have to be a rhombus, rectangle, or square.

### Lesson Narrative

In previous lessons, students learned how to compare and describe shapes using geometric attributes. In this lesson, students analyze examples and non-examples of rectangles, rhombuses, and squares in order to identify their defining attributes. As they discern and describe features that define these quadrilaterals, students practice looking for structure (MP7) and communicating with precision (MP6).

Throughout the lesson, offer rulers to students if needed to determine if sides have the same length.

• Engagement
• MLR8

Activity 1: What Makes These Shapes So?

### Learning Goals

Teacher Facing

• Identify attributes of rhombuses, rectangles, and squares.

### Student Facing

• Let’s find out what makes rectangles, rhombuses, and squares what they are.

### Required Preparation

Activity 1:

• Create a chart with labels showing a rectangle, rhombus, and square for the lesson synthesis.

### Lesson Timeline

 Warm-up 10 min Activity 1 35 min Lesson Synthesis 10 min Cool-down 5 min

### Teacher Reflection Questions

Today students carefully analyzed attributes of specific quadrilaterals. How did this work prepare them to see a square as both a rhombus and a rectangle in future lessons?

### Suggested Centers

• Picture Books (K–5), Stage 3: Find Shapes (Addressing)