9-7   Size Changes- Expansions



1.    On a blue print, the front of my house is 2 feet long.  In real life, the front of my house is 28 feet long.
        Therefore, my house is how many times larger than it is on the blue print?

                                                                                                                        _______________
 

2.    I set the xerox machine to enlarge an image by a size change factor of magnitude 3 (300%).
        a.)  how long would teh xerox machine make the diameter
              of a coin look if its original diameter is 1.5 cm?              _______

        b.)  If a xerox copy of a line is 12 cm, what was the original length of the line?  ________
 
 

3.    Let  A = (2,3)        B = (3,5)        C = (5,1)
       a.)  What would A', B', and C' be under
              an expansion of magnitude 2?                            A' = _____    B' = _____   C' = _____

       b.)  What would A', B', and C' be under
              an expansion of magnitude 2?                            A' = _____    B' = _____   C' = _____

       c.)  What would A', B', and C' be under
              an expansion of magnitude 2?                            A' = _____    B' = _____   C' = _____
 

4.    True or False:  In an expansion of magnitude 2, line segment AB would be parallel to line segment A'B'.
 

5.    True or False:  If I draw a line from A to A', it will go threw the origin.
 

6.    A microscope lens magnifies objects 125 times their actual size.
        a.)  How thick would a roach's leg appear under the microscope if it is .5 mm thick?  __________

        b.)  How long would the iris of its eye appear if it is .075 mm long?  __________

        c.)  If under the microscope I see a round amebia that appears to be 2.5 mm in diameter, how long is
              its diameter in real life?
                                                    ___________
 

7.    Graph the triangle CWH with verticies (-2,-3), (3,-1), and (2,2) and its image under an expansion of 2?
 

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