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Yes they are. In a 2-dimensional plane, a circle is completely defined by the location of its centre and its radius. The first of these is irrelevant for similarity. The second, its radius is also the circle's only scale factor. And since similarity permits changes in the scale, a circle is not changed by altering its scale factor. Consequently all circles are similar.
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Earn +20 ptsQ: Are circles similar and why?
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Continue Learning about Math & Arithmetic
Why does Pi work for all circles?
Because all circles are similar.
If Two different circles have same circumference?
Then they are similar.
Which figures are always similar in geometry?
Circles and all regular polygons.
What solid figure is a set of your parallel cross sections are circles that are similar but not congruent?
A sphere is.
The top side and front views of a solid figure are similar circles what shape is the solid?
A sphere?
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