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    Hey how do I enlarge a shape using a negative fractional scale factor like -1/2 and a positive scale factor like 3/2 pls help
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    (Original post by Rhea.dh)
    Hey how do I enlarge a shape using a negative fractional scale factor like -1/2 and a positive scale factor like 3/2 pls help
    Draw a straight line from the centre of enlargement to one vertex of the shape. Measure this distance. Multiply the measured distance by 3/2. Extend the initial line such that it is equal to this value. The end of this line represents the vertex of the ENLARGED shape.

    Repeat for all other vertices.

    Can you apply this for the case of -1/2 ? HINT : The 'enlarged' shape will be smaller.
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    (Original post by Rhea.dh)
    Hey how do I enlarge a shape using a negative fractional scale factor like -1/2 and a positive scale factor like 3/2 pls help
    For 3/2:

    Draw a line from (-1,0) to one of the object points e.g. (1,1) then this represents a scale factor of 1. A scale factor of 2 is double this line and then a scale factor of 3/2 = 1.5 is between 1 and 2. So this line will go from (-1,0) to (2, 1.5) and so (2, 1.5) will be your image point.

    Do this for the six points (or as many as you need) and then join the image points up to form the image.


    -1/2:

    Going the opposite way but with the same length as the original line gives you a scale factor of -1 and a scale factor of -1/2 will be half of the line so you'll get a line from (-1,0) to (-2,-1/2) and so (-2,-1/2) will be your image point.


    Here's something to illustrate all this:

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    Thanks guys I got it xx
 
 
 
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