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Yes, all circles are similer, they all have 1 line, all the same shape, any quarter of a circle will always be 25%, but it the line is bigger they still have differances and similarities, e.g a circle can have a radius of 25cm while another can have a radius of 93984389569349billion miles
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What shape is always similar?
Squares and circles are always similar.
Are circles similar or congruent?
Similar, in most instances. All their interior angles add to 360 (without exception), however, the measure of the diameter, perimeter (etc) could be different.
Do all circles have a diameter?
yes
What are congruent circles?
Circles that have congruent radii. Congruent=coinciding at all points when superimposed (http://dictionary.reference.com/browse/congruent)
Are all circles congurent?
No, they are all similar but, since the radii can differ, they need not be congruent.Two objects are congruent if they have the same dimensions and shape. Very loosely, you can think of it as meaning 'equal', but it has a very precise meaning that you should understand completely, especially for complex shapes such as polygons.
