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the value of pie=22/7, or 3.14, or 180. 4 pie= 4*22/7, or 3.142*4, or 180 *4. square of 4 pie= 7744/49, or 158.022, or 518400.
for the surface area:4 times pie times radius squared for volume:4/3 times pie times radius cubed
You are correct my friend! Surface Area of a Sphere is indeed = 4(pi)r^2 and that is also equal to Circumference times Diameter!
a 1x1 square
the square root of 4 is 2 so you just multiply 4 times 2. the answer is 8