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Very Confused please help!

Circle 1 is centered at (5,8) and has a radius of 8 centimeters. Circle 2 is centered at (1,−2) and has a radius of 4 centimeters. What transformations can be applied to Circle 1 to prove that the circles are similar? Enter your answers in the boxes.

The circles are similar because you can translate Circle 1 using the transformation rule (_ , _) and then dilate it using a scale factor of ( _ )
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Very Confused please help! Circle 1 is centered at (5,8) and has a radius of 8 centimeters-example-1

2 Answers

2 votes

Hope this helps! Took the test. Good luck!

Very Confused please help! Circle 1 is centered at (5,8) and has a radius of 8 centimeters-example-1
User Vincentlcy
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4 votes
we know that
Figures can be proven similar if one, or more, similarity transformations (reflections, translations, rotations, dilations) can be found that map one figure onto another.
In this problem to prove circle 1 and circle 2 are similar, a translation and a scale factor (from a dilation) will be found to map one circle onto another.

we have that
Circle 1 is centered at (5,8) and has a radius of 8 centimeters
Circle 2 is centered at (1,-2) and has a radius of 4 centimeters

step 1
Move the center of the circle 1 onto the center of the circle 2
the transformation has the following rule

(x,y)--------> (x-4,y-10)
so
(5,8)------> (5-4,8-10)-----> (1,-2)
so
center circle 1 is now equal to center circle 2
The circles are now concentric (they have the same center)

step 2
A dilation is needed to decrease the size of circle 1 to coincide with circle 2

scale factor=radius circle 2/radius circle 1-----> 4/8----> 0.5

radius circle 1 will be=8*scale factor-----> 8*0.5-----> 4 cm
radius circle 1 is now equal to radius circle 2

A translation, followed by a dilation will map one circle onto the other, thus proving that the circles are similar

the answer is
The circles are similar because you can translate Circle 1 using the transformation rule (x-4,y-10) and then dilate it using a scale factor of (0.5)
User Daniel Tkach
by
5.4k points
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