1. SWBAT: Find the area of a trapezoid and a rhombus.

2.  Using two 3 x 5 note cards, cut along a line from one vertex to the opposite side.  Discard the two triangles that you cut off.  What new shapes did you create?  How do they compare?  Label the height and the two bases of the trapezoids.  Put the two edges labeled height together.  What new shape is created?  How does the area of one trapezoid compare to the area of the parallelogram?

3.  Where base and height are perpendicular!  Examples: 1)2)

4. 3) Find the height of a trapezoid that has an area of 50 square yards and bases of 8 yards and 12 yards.

5.  For the shape below, how can we find the area using triangles? h1h1 h2h2 A D C B If the diagonals of a quadrilateral are perpendicular, the area is one half the product of the diagonals.

6. 4) Find the area.5) A rhombus with a 20 cm diagonal has an area of 300 sq cm. Find the perimeter of the rhombus.

7.  Write the formulas from today’s notes on top of your paper.  10.4 ex. 13-21, 22, 24, 26, 35, 36