Day 25 of 30
Perimeter and area formulas as expressions
Content is AI-assisted and continuously improved through educator review
Learning Objective
Students will explore perimeter and area formulas as expressions through guided practice and application.
In this lesson, we'll explore perimeter and area formulas as expressions. Mathematical thinking develops logical reasoning and problem-solving abilities.
An expression is a combination of numbers, variables, and operations (like +, −, ×, ÷). Unlike an equation, an expression doesn't have an equals sign. Examples: 3x + 5, 2(4 + 1), or 7 − 2. Expressions represent a value, and we can simplify them by following the order of operations. Think of expressions as mathematical phrases, while equations are complete sentences!
As you work through today's material, pay attention to the examples and try to identify the patterns or strategies being used. This will help you apply these concepts to new problems.
Take notes on key points and make connections to what you've already learned in previous lessons.
The total length of a polygon's boundary
The amount of surface enclosed within a boundary
Instructions
Materials Needed
- Notebook
- Calculator (if needed)
- Graph paper
A rectangle has length 8 cm and width 5 cm. What is its perimeter?
A square has sides of 4 inches. What is its perimeter?
Find the perimeter: Triangle with sides 3 ft, 4 ft, 5 ft.
Teaching Tip
For advanced learners: Encourage deeper analysis and real-world connections. Consider extension activities that allow students to apply perimeter and area formulas as expressions to novel situations.