S' is a dilation of S. Does this dilation have a scale factor greater than 1 or less than 1?
Greater than 1
If we wanted to figure out the center of dilation for two triangles, how could we find it?
Draw rays through each corresponding set of vertices and see where they intersect.
What is the scale factor for this dilation?
2
A triangle has points A(2,1), B(3,4) and C(5,2) and a center of dilation at (0,0). It is dilated by a scale factor of 2. What are the coordinates of C'?
(10,4)
If you dilate DEF with a center of dilation at (0,0) and a scale factor of 1/2, what are the coordinates of D'?
(1,3)
What is the center of dilation in this image?
(0,0)
If this shape is dilated by a scale factor of 3 with a center of dilation at (0,0), what are the coordinates of C'?
(3,6)
A shape is dilated by a scale factor of 3. How can we represent this algebraically? (x,y) -----> (____,____)
(x,y) -----> (3x,3y)
A dilation with a scale factor greater than 1 is called an __________
Enlargement
A triangle is dilated by a scale factor of 1/2. How can we represent this algebraically? (x,y) ----> (_____,____)
(x,y) ----> (1/2x,1/2y)
What is the scale factor of this dilation?
2
A dilation with a scale factor between 0 and 1 is called a ____________
Reduction
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