Think of a diameter as two radii in a straight line...
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The radius of a circle is half of the diameter! So, if the diameter was four inches, the radius would be two inches!
Radius = 1/2 of diameter = 7/2 = 3.5 inches
The circumferecne of a circle with diameter d is pi*d So diameter = circumference / pi = 36/pi = 11.46 inches. Radius = diameter/2 = 5.73 inches.
Oh, dude, the radius of a circle is just half of the diameter, so for an 11-inch circle, the radius would be 5.5 inches. Like, it's just basic math, nothing to lose sleep over. So yeah, the radius is 5.5 inches, but who's really measuring, right?
To find the diameter, 48/pi To find the radius, (48/pi) then divide by 2 :)