 The class scored the following scores on the test: 20, 92, 82, 85, 92.  Median? Mean? Mode?  Is the mean or median more useful in this situation? Why?

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Presentation transcript:

 The class scored the following scores on the test: 20, 92, 82, 85, 92.  Median? Mean? Mode?  Is the mean or median more useful in this situation? Why?  20 is an outlier.  Other situations where the mean or median is more useful?

 Take a minute to write down what characteristics might be necessary to call a shape a parallelogram.

 A parallelogram is a quadrilateral with both pairs of opposite sides parallel. >> > >

 Fold a piece of graph paper into fourths.  In the top left quadrant draw a parallelogram ABCD it can be big or small. No rectangles.  What are the slopes? AB = ?, BC =?, CD =?, DA =?  How do you know it’s a parallelogram? >> > >

 Fold a piece of graph paper into fourths.  In the top right quadrant draw a parallelogram EFGH it can be large or small. No rectangles.  Try to make it so the sides are not of equal length.  What can you conclude about the opposite sides of a parallelogram? >> > >

 Solve for x and y

 In the bottom left quadrant draw a parallelogram make this one fairly big. No rectangles.  Now measure the angles.  What two traits do you notice? Discuss with your neighbor. >> > >

 Solve for a and b

 In the bottom right quadrant draw a parallelogram make this one fairly big. No rectangles.  Draw the diagonals of the parallelogram.  What do notice about these? Discuss with a neighbor. >> > >

 Solve for r and s

 How much information do we need to know whether or not a quadrilateral is also a parallelogram?

 Prove it!

 PROVE IT!!!!!!!OMG!!

Rewrite this as a two column proof

 Determine whether the shape is a parallelogram. If it is find the remaining information.  6.2) Pg. 333: 20-37, 60,  Pg. 342: 9-15, 17-20, 29