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OpenStudy (anonymous):
A circle has a diameter that starts at (3,7) and ends at (7,3) . What is the radius of circle rounded to nearest tenth
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OpenStudy (gorv):
diameter = distance between these 2 points \[=\sqrt{(7-3)^{2}+(3-7)^2}=\sqrt{16+16}=\sqrt{2*16}=4*\sqrt{2}\]
OpenStudy (gorv):
radius=diameter/2=4 (sqrt2)/2=2*sqrt2
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