Problem Solving with Area of Triangles

6.8D Area of Triangles

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

LEARNING GOAL

I am learning to write equations related to the area of triangles and parallelogram and to determine solutions.

SUCCESS CRITERIA

*I can identify the geometric figure

* I write the formula for the area of triangle

*I can plugin numbers to find the area

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INTRO

A Triangle is

half of a Parallelogram

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

I DO

WE DO

YOU DO

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 best estimate of the area of a triangle that has a base of 23.62 cm and a height of 8.33 cm?

• 200 square cm

• 160 square cm

• 100 square cm

• 50 square cm

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