Parallelograms and Rectangles

Area of Rectangles and Parallelograms - Missing Part

Lesson Goals

• Determine the base or height of a parallelogram when the area is given.

• Determine the base or height of a rectangle when the area is given.

• Solve real-world problems related to the area of parallelograms.

Standards

• 6.GM.4

  Find the area of complex shapes composed of polygons by composing or decomposing into simple shapes; apply this technique to solve real-world and other mathematical problems.

Multiple Choice

Review:
Simplify this expression

$$48.9\ \cdot5.7$$  

• 54.6

• 5.46

• 278.73

• 2787.3

Multiple Select

What is the formula for finding the are of a rectangle?

• Area = depth x width

• Area = base x height

• Area = length x depth

• Area = base x radius

Multiple Select

What is the formula for finding the are of a parallelogram?

• Area = depth x width

• Area = length x depth

• Area = base x height

• Area = base x radius

So if Area = bxh what if you know the area but need to know the height or base?

• A=bh can also be

   $\frac{A}{b}=h$   $\left(A\div d=h\right)$  

• and/or  $\frac{A}{h}=b$   $\left(A\div h=b\right)$  

Lets try one

• What do we know?

•  $A=\ 88cm^2$  h = 8cm

• So we are missing b. 

•  $88cm^2=b\cdot\left(8cm\right)$  

• To solve =  $\frac{88cm^2}{8cm}=b$  

Fill in the Blanks

What is the base of this rectangle? (Don't forget the unit!)

What about this one?

• Is there any missing information?

• What do we know?

Fill in the Blanks

What is the height of this shape? (Make sure you add the unit!)

What is the missing dimension?

• What do we know?

Fill in the Blanks

What is the height of this shape?

Poll

How are you feeling about Area?

Questions?

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