Finding the Area of Triangles and Polygons

Area = 1/2 x base x height (A=1/2bh)

• triangle formula

• parallogram formula

• altitude

• decomposition

The amount of units inside a closed figure; it is measured in square units.

• altitude

• decomposition

• triangle formula

• area

Irregular figures can be separated into triangles and other polygons in order to find area

• decomposition

• area

• parallelogram formula

• altitude

Area is measured in...

• cubic units

• square units

• units

• no units are needed

Find the area.

• 46.2 ft²

• 92.4 ft²
  

• 46.2 ft

• 92.4 ft

Mrs. Bailey has a Rangers pennant that has a base of 12 inches and is 20 inches tall. What is the area of the Rangers pennant?

• 240 in²

• 120 in²

• 32 in²

• 24 in²

Find the area:

• 40 yd

• 40 yd²

• 80 yd²

• 18 yd²

Roger and Joanne are planting a rectangular garden. The garden is 9 1/2 ft by 13 ft. They want to use half the garden for cucumbers and half the garden for tomatoes. They decide to separate the garden into the two right triangles as shown. What is the area of the tomato part of the garden?

• 61.75 ft²

• 61.75 ft

• 123.5 ft²

• 123.5 ft

What is the area of this figure?

• 7 units²

• 15 units²

• 7 1/2 units²

• 15 1/2 units²

Find the area the shaded region

• 30 units²

• 9 units²

• 21 units²

• 25.5 units²