Rectangles & Squares
How is a rectangle different than a square?
A rectangle can a length and width that are different measurements.
What is area?
the measurement of the space inside an object (surface area)
What is perimeter?
Perimeter is the measurement around an object (outline)
Sarah has a square napkin that has a perimeter of 20 cm. What is the length of one side?
20/4=5 cm
rectangle
square
parallelogram
trapezoid
rhombus
Name two ways that you can calculate the area of a rectangle
1. Count the grid squares
2. multiply the length times the width
What is the perimeter of a rectangle that is 7 meters long and 5 meters wide?
7 + 7 + 5 + 5 =24 meters
I have a rectangular book with a length of 6 meters and a perimeter of 20 meters. What is the area?
4 x 6 = 24 square meters
True or False
A rectangle is a square
False
A square has a length of 5 meters. What is the area?
25 square meters
A square has an area of 81 square feet. What is the perimeter?
Each side is 9 feet long. The perimeter is 9 + 9 + 9 + 9= 36 feet.
The cost of painting the ceiling of a room is $5 per square foot. The rectangular room is 15 feet by 12 feet. How much will it cost to paint the ceiling?
$900
List 3 properties of a square
1. All sides are equal in length
2. opposite sides are parallel
3. All angles are right angles (90 degrees)
The perimeter of a square is 32 inches. What is the area?
Each side is 8 inches. The area is 64 square inches.
Look at the object drawn on the board, What is the perimeter?
54 feet
The length of a rectangle is twice its width. The area of the rectangle is 36 square inches. What is the perimeter?
24 inches
List 3 properties of a rectangle
1. opposite sides are parallel
2. opposite sides are equal
3. All angles are right angles (90 degrees)
Two identical squares are lined up against each other. The perimeter of the two shapes is 24 yards. What is the area of one square?
Each side of one of the squares is 4 yards. The area of one square is 16 square yards.
Find the perimeter for the shape on the board.
28 inches
Fred has a fence that is 12 feet long and 8 feet wide. Inside the fence is his dog's house. The dog house is exactly 2 feet away from the fence on all sides. What is the area of the dog house?
36 square feet