12C + 12D Area of a rectangle

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 2

Area of a rectangle

Schedule: 

• Learning goals 
• Folding activity 
• Area of a rectangle
• Match the perimeter and area with the figure

Learning goals 

At the end of this lesson I can:

•  Find the area of a shape by counting sqaures
• Calculate the area of a rectangle with the formula

Fold away! 

1. Find the perimeter and area of the flat cat 

2. Fold the flat cat following the fold lines

3. Find the perimeter and area of the square hare

4. Fold the square hare following the fold lines

Area of a rectangle

Area of a rectangle = Length · Width 

What kinds of units do we use for area? 

Matching game

Make matched of 4 cards: 

- A rectangle 

-its perimeter

-its area 

-the calculation for its perimeter OR area 

Find all 8 matches!! 

Extra practice ( + Help)

Open your book at P. 256

Start with question 1 and time yourself. 

How long does it take you to find the area of all the rectangles in question 1?

 (You are allowed to use a calculator but you can make it extra challenging by doing it without) 

Check your work, for every wrong answer: add 30 seconds to your final time. 

For example: A student finished the questions in 3 min and 25 second but made 2 mistakes. 

Their final time is 3 min 24 sec + 30 sec + 30 sec = 4 min 24 sec. 

What was your final time for question 1?

Between 0:30 and 1:00

Between 1:00 and 1:30

Between 1:30 and 2:00

Between 2:00 and 2:30

Between 2:30 and 3:00

Between 3:00 and 3:30

Between 3:30 and 4:00

Between 4:00 and 4:30

Between 4:30 and 5:00

Longer than 5 min

Extra practice (+ help) 

Time yourself again for question 2!

Watch out, the lengths are given in different units!!

What was your final time for question 2?

Between 1:00 and 2:00

Between 2:00 and 3:00

Between 3:00 and 4:00

Between 4:00 and 5:00

Between 5:00 and 6:00

Between 6:00 and 7:00

Longer than 7 min

Extra practice

P. 257               4, 5, 6

Challenge

P. 257             5, 9

Challenge

Surface area: the surface area of a 3D shape is the combined area of all the sides of the shape. 

Challenge

Practice with:

ManageBac > Files > Unit 5 Measurements > Surface area 1

ManageBac > Files > Unit 5 Measurements > Surface area 2