The radius (not raduis) is 8 inches.
A circle with a diameter of 8 inches has a radius (not raduis) of 4 inches.
4 inches
8 inches.
The radius would be 4 inches !
the diameter of a circle is from one side of the circle to the other, and the raduis is always half, because the raduis is from the side to the middle, so the answer is 18
Assuming the diameter is 10.8 then the radius (not raduis) is 5.4 units.
The radius (not raduis) is 6 inches.
Diameter is 8 and a half
Divide the diameter by 2.
113.09734 square inches
A diameter of a circle (or sphere) is a straight line which is twice as long as its radius (not raduis).
circumference = 2*pi*9 inches