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Finding the Center of Dilation

Finding the center of dilation

In the applet below, construct lines through corresponding points of the image and pre-image (i.e. A and A'). Use the slider to change the scale factor of the dilation. Consider the following questions: 1) What do you notice? Were you surprised by this? Why or why not? 2) What is point E as it relates to the diagram? What convinced you of this? 3) Move Point E to coincide with the vertices of the quadrilateral. What do you notice? 4) Measure the line segment and . Use the slider to change the Scale factor. What is the relationship between the two segments? Can you write an equation defining the relationship?

Center of Rotation Exploration