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Drupady [299]
3 years ago
11

If a circle has a center at the point (3, 4) and goes through the point (6, 8), what is the radius?

Mathematics
1 answer:
denis23 [38]3 years ago
7 0
Start with the eqn of a circle with center at (h,k) and radius r:

(x-3)^2 + (y-4)^2 = r^2.  Now replace x with 6 and y with 8:

(6-3)^2 + (8-4)^2 = r^2
 
3^2 + 4^2 = r^2  =>  r = 5.
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