Area and Perimeter with Expressions

Finding Area and Perimeter with Expressions as Dimensions

Multiple Choice

The distance around an object is called...

• area

• perimeter

Multiple Choice

The space inside an object is called...

• area

• perimeter

Multiple Choice

If I wanted to put tile down in my kitchen, I would need to find the ...

• area

• perimeter

Multiple Choice

If I wanted to place a border around my pool, I would need to find the ...

• area

• perimeter

Multiple Choice

How do you find area of a square or rectangle?

• Length + Width

• Length x Width

Finding Area of a Square and Rectangle

Length x Width

Multiple Choice

Find the AREA of this figure.

• $160\ ft^2$
  

• $1600ft^2$
  

• $26ft^2$

What if I want to find the Area of this rectangle?

What Should I DO?

Hopefully you still said Multiply

• But wait we have an expression as one of the dimensions

• Let's set it up: 10 ( 3x - 1 )

• Now, What method can we use to solve for area of this rectangle?

Multiple Choice

Use the Distributive Property to help solve 10( 3x - 1 )

• 30x - 1

• 30x - 10

• 20x

• 3x - 10

Fill in the Blank

Find the area of this rectangle with given length (x + 3) and width ( 4 ):

Fill in the Blank

Find the area of this rectangle with given length (x - 5) and width (10):

Multiple Choice

How do you find perimeter of any shape?

• Add ALL sides together

• Multiply ALL sides together

Finding Perimeter of a Rectangle

2(Length) + 2(Width)

Finding Perimeter of a Square

4(sides)

Finding Perimeter of a Triangle

Side 1 + Side 2 + Side 3

Multiple Choice

Find the perimeter of the rectangle.

• 9

• 53

• 18

• 14

Let's Find the Perimeter of this Triangle

• First, write your work out: Side 1 + Side 2 + Side 3

• x + x + 4 + x + 6

• What method can I use to simplify this expression?

Hopefully you said Combine Like Terms

• x + x + 4 + x + 6

• Combine your "x" terms and then Combine your constants

• 3x + 10

• Are we Done?

Multiple Choice

Is the perimeter of this triangle 3x + 10

• yes

• no

Multiple Choice

What is the perimeter of the rectangle in simplest form?

• 12x - 2

• 12x + 10

• 12x - 10

• 8x - 10

Fill in the Blank

What is the perimeter of the figure in simplest form?

Fill in the Blank

A square has side length x - 2. Find the perimeter of the square.

Fill in the Blank

What method can we use to solve for area given the length or width as an expression? (2 word answer)

Fill in the Blank

What method can we use to solve for perimeter given the lengths and widths as expressions? (3 word answer)