March 25, 2010 Math 201 OBJECTIVE: Students will be able to determine the area of triangles and quadrilaterals (squares, rectangles, rhombi, and trapezoids) AIM: How can we develop a formula to find the area of any parallelogram from what we know about the area of a rectangle? STANDARDS: 6.G.2 PRIOR KNOWLEDGE: What is the area of a rectangle with a length of 7 inches and a width of 4 inches? 7 4

Recall that area is the amount of surface that a figure covers. Recall that parallel lines are lines that never intersect. (What are some examples in everyday life where we see parallel lines?) Recall that a quadrilateral is a figure with 4 sides.

A parallelogram is a quadrilateral with both pairs of opposite sides parallel and equal in length.

A rectangle is a quadrilateral with angles fixed at 90º How can we find the area of the figure above?

Handout Parallelogram How can we find its area? Count the squares? Why or why not?

If I take this triangle and move it to the end… What figure do I now have?

If I know the length and the width of this rectangle, can I find its area??