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radius *2 = diameter so then plug the radius in... 4*2=8 8 is the diameter of the figure.
The radius is half the diameter. So, if the diameter is 8, then the radius is 4.
8 units; the diameter of a circle is twice its radius.
Volume is 4/3 pi*radius*radius*radius 3.14 times 7 times 7 times 7 times 4 divided by 3= volume 1436.2666666 Surface area is 4 * pi * radius * radius 4 times 3.14 times 7 times 7=surface area 615.44
4 cm radius = Area of 50.26548 sq. cm.