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 Blanks

Fill in the Blanks

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 Blanks