Perimeter/Area

Perimeter & Area

​I can use addition and multiplication to solve problems involving perimeter and area.

Calculating Perimeter:

​

• Perimeter= length+width+length+width

• ​Perimeter = (side + side) x 2

• ​Rectilinear Shapes-

  • Count the square units that lay flat on the shape.

  • Count the sides!

Multiple Choice

Which equation would you should use to find the perimeter?

• 7+5=12 cm

• 7+5+7+5=24 cm

• 7x5=35 cm²

• 7x5x7x5=1225 cm²

Multiple Choice

What is the perimeter of the shaded figure?

• 12 units

• 10 units

• 16 units

• 18 units

Multiple Choice

What is the perimeter of the rectangle? (Hint: top matches the bottom, left matches the right!)

• 48 feet

• 27 feet

• 28 feet

• 30 feet

Multiple Choice

What is the perimeter of the fence?

• 25

• 30

• 35

• 40

​Some shapes are IRREGULAR!

Just add the sides

Multiple Choice

What is the perimeter of this shape?

• 24cm

• 8cm

• 35cm

• 17cm

Poll

How well do you understand perimeter?

• I could teach it!

• It's pretty easy!

• I almost got it!

Calculating AREA:

​

​​

• Area is ​Units squared (units²)

• Area=​Length x Width (Rectangles)

• Sum of all square units.

• What other squared units could we use to measure an area?

​

Multiple Choice

So what is the area of figure?

• 8 square cm

• 16 square cm

• 15 square cm

• 15 cm

What if there are no numbers?

Multiple Choice

What is the area of the shape?

• 20 square units

• 21 square units

• 15 square units

• 12 square units

Does the area and perimeter need to be the same number?

Multiple Choice

What is the AREA and PERIMETER of the shape?

• A=25 square units

  P=24 units

• A=20 square units

  P=25 units

• A=15 square units

  P=24 units

• A=22 square units

  P=22 units

Multiple Choice

What is the area and perimeter of this rectangle?

• P=21 units

  A=18 square units

• P=12 units

  A=9 square units

• P=3 units

  A=3 square units

• None of the above.

Multiple Choice

Find the area of the following figure?

• 32 square units

• 16 square units

• 15 square units

• 31 square units

• 9 square units

Multiple Choice

What is the area of the shape?

• 28 square m

• 29 square m

• 30 square m

• 11 square m

Multiple Choice

What is the area of the shape?

• 20 square feet

• 24 square feet

• 15 square feet

• 24 feet

Multiple Choice

Find the area of the following figure?

• 10 cm squared

• 14 cm squared

• 12 cm squared

• 8 cm squared

Poll

How are you feeling about AREA?

• I could teach it!

• Area is pretty easy.

• I think I will have it with a little bit of practice

• Help, I don't get it!