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Finding the area of a Trapezoid

Finding the area of a Trapezoid. SWBAT find the area of a trapezoid by decomposing it into two triangles and using the formula. Who did Ms. Dalton meet this weekend?. Do Now. 1. What is the formula for the area of a rectangle? Provide an example.

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Finding the area of a Trapezoid

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  1. Finding the area of a Trapezoid SWBAT find the area of a trapezoid by decomposing it into two triangles and using the formula.

  2. Who did Ms. Dalton meet this weekend?

  3. Do Now • 1. What is the formula for the area of a rectangle? Provide an example. • 2. What is the formula for the area of a parallelogram? Provide an example. • 3. What is the formula for the area of a triangle? Provide an example.

  4. Vocabulary • -Trapezoid: a 4-sided flat shape with straight sides that has a pair of opposite sides parallel. • - Decomposing: breaking a shape up into two other shapes (Ex: a trapezoid into 2 triangles) • Review: • What does parallel mean? • How do we measure height?

  5. Area of a Trapezoid Draw a diagonal line to break the trapezoid into two triangles. Find the area of each triangle Add the area of each triangle together See the diagram below. 10 in 5 in 12 in

  6. 12 cm Example. Find the area of the figure 
by drawing a diagonal and splitting it into two 
triangles. 10 cm 11 cm 9 cm 12 cm 10 cm 11 cm click to reveal 9 cm

  7. The Area (A) of a trapezoid is also found by using the formula: Note: The base & height always form a right angle! 10 in 5 in 12 in

  8. Try These. Find the area of the figures using the formula. 12 ft 10 7 6 8 8 ft 8 ft 7 ft 13 9 ft click to reveal click to reveal

  9. Exit Ticket: Explain in words two methods to find the area of a trapezoid. Include visuals.

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