Mathematics
Grade 7
15 min
Relationship between area and perimeter
Relationship between area and perimeter
Tutorial Preview
1
Introduction & Learning Objectives
Learning Objectives
Define and differentiate between area and perimeter for basic 2D shapes.
Accurately calculate the area and perimeter of rectangles and squares.
Explain how changes in a shape's dimensions affect its area and perimeter.
Demonstrate that shapes with the same perimeter can have different areas.
Demonstrate that shapes with the same area can have different perimeters.
Solve real-world problems involving the relationship between area and perimeter.
Analyze how to maximize or minimize area for a given perimeter (or vice-versa) for simple rectangular shapes.
Have you ever wondered why a long, skinny fence might enclose less space than a more square-shaped one, even if they use the same amount of fencing? 📏🤔
In this lesson, you'll explore the fasci...
2
Key Concepts & Vocabulary
TermDefinitionExample
AreaThe amount of surface a two-dimensional shape covers, measured in square units (e.g., square centimeters, square feet).The area of a classroom floor tells you how many square tiles are needed to cover it.
PerimeterThe total distance around the outside edge of a two-dimensional shape, measured in linear units (e.g., centimeters, feet).The perimeter of a soccer field is the distance a player runs if they jog along all its edges.
RectangleA quadrilateral (a four-sided polygon) with four right angles, where opposite sides are equal in length.A standard piece of notebook paper or a rectangular swimming pool.
SquareA special type of rectangle where all four sides are of equal length.A chessboard square or a perfectly square window pane.
DimensionsThe measurements of a...
3
Core Formulas
Perimeter of a Rectangle
$P = 2(l + w)$
This formula calculates the total distance around a rectangle, where 'l' is the length and 'w' is the width. You add the length and width, then multiply by 2 because there are two lengths and two widths.
Area of a Rectangle
$A = l \times w$
This formula calculates the amount of surface a rectangle covers, where 'l' is the length and 'w' is the width. You multiply the length by the width to find the number of square units inside.
Perimeter of a Square
$P = 4s$
This formula calculates the total distance around a square, where 's' is the length of one side. Since all four sides are equal, you simply multiply the side length by 4.
Area of a Square
$A = s^2$
This formula calc...
5 more steps in this tutorial
Sign up free to access the complete tutorial with worked examples and practice.
Sign Up Free to ContinueSample Practice Questions
Easy
What is the perimeter of a rectangle with a length of 10 cm and a width of 5 cm?
A.15 cm
B.50 cm²
C.50 cm
D.30 cm
Easy
A square garden has a side length of 7 meters. What is its area?
A.28 m
B.14 m²
C.49 m²
D.49 m
Easy
If a problem states that a farmer has a 'fixed perimeter' of 100 feet of fencing, what does this mean?
A.The total length of the fence cannot change, but the shape of the enclosure can.
B.The area of the enclosure must be 100 square feet.
C.The length of the enclosure must be 100 feet.
D.The shape of the enclosure must be a square with 100-foot sides.
Want to practice and check your answers?
Sign up to access all questions with instant feedback, explanations, and progress tracking.
Start Practicing Free