2 x pi x r
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2(pi)r=2X3.14X3cm=18.85cm to four significant figures
Take the circumference of a circle and divide it by the diameter of that circle: ∏=C/D
The surface area of a cylinder can be found using the following formula - SA = 2(Pi*r2) + (2*Pi*r)*(H) Pi = Approximately 3.14 r = Radius of the base of the cylinder H = Height of the cylinder
2 pi r h
The radius(radii is the plural) of the circle is half the distance of circle's diameter. The formula is r=(1/2)diameter.