Perimeter
Write a definition for perimeter.
The distance around a figure.
Define area.
The measure of the number of square units needed to cover a flat surface.
Problem number 5
3 centimeter
Problem 1 on handout
Area = 10 square units, Perimeter = 16 units
I can divide the shape into smaller sections and find the area of those sections. Then add the sums together to find the area of the larger figure.
Mr. Howard is putting wood trim around his window. How many feet of wood trim doe Mr. Howard need for the perimeter of the window? (Side lengths are 2 feet, 3 feet, 2 feet, and 3 feet)
10 feet
Give me another way to find the area other than counting the square units.
Repeated addition, multiplying length times width, using the Distributive property
Problem number 6
4 feet
True or False: A figure can be broken into any smaller sections in order to find the area.
True
If the area of a square is 100 square feet, then what would be the perimeter?
40 feet
If the area of a square is 36 square inches, what is the perimeter?
24 inches
I am planting carrots in 3 rows of 12. I am also planting 4 rows of 5 turnips. How many vegetables am I planting in total?
56 vegetables
The perimeter of a figure is 24 units. I have side lengths of 6, 6, 2, 3, 5, and x units. What is the missing number?
The missing number is 2 units.
Problem number 2 on handout
Area = 25 square units
problem 10
9 inches
True or false: To find the perimeter of a rectangle, I should multiply the length times width.
False. I should add all the side lengths together.
Which rectangle has the smallest area? Rectangle 1: 8 in by 3 in, Rectangle 2: 6 in by 7 in, or Rectangle 3: 5 in by 9 in
Rectangle 1 has the smallest area of 24 square inches
I am given the perimeter of a rectangle which is 20 units. If the area is 9 square units, what are the possible side lengths?
9, 9, 1, and 1
Problem 3
16 centimeters
Problem 9
24 square centimeters
I have two a rectangle that is 5 meters long by 3 meters wide. I have another rectangle that is 7 meters long by 2 meters wide. Which shape has the larger perimeter?
The second rectangle is larger. It has a perimeter of 7 + 7 + 2 + 2 = 18 meters.
Find the area of this rectangle. 7in by 5 in
35 square inches
Problem number 12
8 feet
Problem 8
30 square meters
Problem 11
27 square units