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May 1, 2009

    Find the values of the variables.
                                 4
          30o
                        g
                12
      x
                                     k
                             o
                            45


                y
Ratio of    Ratio of
               Perimeters
Scale Factor                 Areas
same as 
Ratio of Perimeters 
                           scale factor

                                      2
                       same as 
                       (          )
Ratio of Areas
                       scale factor
The following rectangles are similar.

     18 feet
                            10 feet




A) What is the ratio of the perimeters?

B) What is the ratio of the areas?
A = 128 in2



16 in
                      10 in


                       What's the area?
The two diamonds are similar.
           2
  A= 95 cm
10 cm              18 cm




                   What's the perimeter?
                   What's the area?
The two triangles are similar.
   The scale factor is 4:3

        2
A = 42 ft
                        x




4 ft
HW: pg. 740 # 3­11, 13, 14, 23

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