Perimeter and Area

Do you have enough information to say how big the pool is?
Why not?
Use the DISTANCE OR LENGTH tool to measure the sides of the pool.
Imagine that one unit on the graph is one foot in real life.
How many feet long is the distance from C to F? Include units.
How many feet long is the distance from E to F? Include units.
The shape of the pool is a QUADRILATERAL specifically a RECTANGLE. The red rectangle below traces the edge of the pool.
Can you use the calculator and the lengths you recorded to find the total distance in feet around the edge of the pool? The value you find is the called the PERIMETER of the pool.
What is the PERIMETER of the pool?
Describe how you calculated PERIMETER.
PERIMETER tells you the the length all the way around a shape. However, this does not tell us all we need to know about the pool's size. We might want to know how much space the pool covers up. To do this, we need to consider every unit of space that the pool covers.
Each box in the red RECTANGLE is one square unit. How many square units are in the red RECTANGLE?
How many square units are in the red RECTANGLE?
Use the AREA tool to confirm your answer.
Think about the lengths of CF and EF that you measured before. How do they relate to the area of the RECTANGLE? Can you write an equation relating the three values?
AREA tells you how much space a shape covers.
Watch the video and follow along with the examples.
Challenge! I want to add a hot tub next to the pool. The hot tub is shown by the blue RECTANGLE.
What is the perimeter of the hot tub? What is the area of the hot tub? You can use the DISTANCE OR LENGTH tool and the AREA tool.
What is the perimeter of the entire shape? What is the area of the entire shape? You can use the DISTANCE OR LENGTH tool and the AREA tool.
Close
– Emily Booth

Information: Perimeter and Area