Area and Perimeter of Triangles, Rectangles and Irregular Polygons

• These are examples of polygons.

• These are examples of regular polygons.

• These are examples of irregular polygons.

• These are examples of non polygons

The area of grandpa's garden is 45 sq. meters. The length is 9 meters. What is the width?

• 7 meters

• 4 meters

• 5 meters

• 6 meters

The formula for area is:

• A = l + w

• A = lw

• A = l + l + w + w

• A = lwh

The area of a rectangle is 60 cm2. The length is 30 cm. That means the width is:

• 30 cm

• 3 cm

• 20 cm

• 2 cm

Find the area of this irregular polygon.

• 100 units squared

• 150 units squared

• 50 units squared

• 200 units squared

What is the perimeter of this shape? (Click to enlarge image.)

• 34 cm2

• 34 cm

• 35 cm

• 33 cm

What is the area of this shape?

(Remember to draw imaginary lines to define two different rectangles in order to calculate the two different area that can then be added together to find the total area of this kind of shape.) Click on image to enlarge.

• 150 sq. cm

• 59 sq. cm

• 29 sq. cm

• 21 sq. cm

Zola is planting a rectangular rose garden. In the center of the garden, she puts a smaller rectangular patch of grass. The grass is 2 feet by 2 feet. What is the area of the rose garden? (Click on image to enlarge.)

• 84 ft²

• 6 ft²

• 88 ft²

• 94 ft²

The formula for Area is A= lw.

It also be written as Base = lw

• True

• False

The distance around an object is called the 

• area

• perimeter

• volume

• circumference