Area of Triangles and Parallelograms

Area of Triangles

How can you use the formula for the area of a parallelogram to find the area of a triangle?

The diagonal of a parallelogram divides it into two identical triangles.

The area of one triangle must be half the area of a parallelogram that has the same base and height.

Multiple Choice

What is the area of this triangle?

• 49 square feet

• 600 square feet

• 100 square feet

• 300 square feet

Multiple Choice

What is the area of this triangle?

• 216 square cm

• 200 square cm

• 108 square cm

• 180 square cm

Fill in the Blanks

What is the area of a triangle with b = 20 in and height = 3 in?

Fill in the Blanks

Poll

How do you feel about finding the area of a triangle?

• Great!

• So-So

• Confused