The circles B and D are similar since the radius of the former is as twice as the radius of the latter.
Are the two circles shown in the figure similar?
By geometry we know that circles are defined by only one characteristic: radius. If two circles are similar, then the radii must be different. After a quick look at the figure, we conclude that the radii are [tex]r_{B} = 4[/tex] and [tex]r_{D} = 2[/tex]. Hence, the circles B and D are similar since the radius of the former is as twice as the radius of the latter.
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