Module8.3Lesson3ExamplesofDilations.notebook
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5/24/25Lesson#33:ExamplesofDilationsHW:Page19#35andCRS18duetomorrow
Donow:CompletePage12#2usingOasthecenter(notO`)
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How many points would you need to separate the circle into to draw an accurate dilated image? Page15
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How many points would you need to separate the circle into to draw an accurate dilated image? Page15UseCompass
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How many points would you need to separate the circle into to draw an accurate dilated image? Page15
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Would you be able to produce a circle as an image from the number of points used in this example?
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What's wrong with using these points?
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What about this image. Does it look like a circle?
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The number of points to dilate that is enough is as many as are needed to produce a dilated image that looks like the original. For curved figures, like this circle, the more points you dilate the better. The location of the points you choose to dilate is also
important.
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What can we do to map this new triangle, triangle A'B'C', back to the original triangle? Be as specific as possible!
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Reverseadilationbyusingascalefactorthat
isthemultiplicativeinverse(reciprocal)ofthefirstscale
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OriginalDilationscalefactor: 2Scalefactortoreversethedilation:
OriginalDilationscalefactor: 17
Scalefactortoreversethedilation:
OriginalDilationscalefactor: 23
Scalefactortoreversethedilation:
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Step 1- Measure the distances between point O and A and point O and A'.
|OA| = 6 units|OA'| = 2 units
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Step 2- Compare the distances and create an equation! You want to now go from A' to A.
|OA| = 6 units|OA'| = 2 units
Think!!! What can I multiply |OA'| by to give me |OA|.
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Ifafigureisdilatedbyscalefactor,r,tobringthedilatedfigurebacktotheoriginalsize,wemustdilateitbyascalefactorof.
Ifascalefactorisr=6,thenthebringadilatedfigurebacktotheoriginalsize,thescalefactormustequal________.
(reciprocal)
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