Today we started our study of quadrilaterals and the algebra used to analyze them. We defined and compared the types of quadrilaterals based on a flowchart and a Venn diagram that you should keep in your notebook. We practiced a higher level thinking skill: always/sometimes/never
We also looked at triangles and quadrilaterals in a coordinate grid and figured out different ways to find their areas. For example, a trapezoid is just a rectangle and two right triangles, and right triangles and rectangles are easy to find area.
We also tried out finding area by "surrounding rectangle" where you take a triangle or quadrilateral and draw a rectangle tight around it. Find the area of the rectangle and then subtract the small pieces around the edges (all right triangles) to get an unknown area.
Next time we will work more on area and also on perimeter in the coordinate plane.
HW #4 needs to be completed. A few have already turned it in. Be sure to graph accurately and find the area of all eight polygons.
Attached below: HW #4, notes on quadrilaterals, and part of the surrounding rectangle activity.