Question

If the cell is spherical in shape and radius of the cell (r) is

20 microns, then its surface is:
a. 50.0026
b. 5026.55ue-2
c. 5.00026
d. 500.026

Answer 1

R = 20E-6 m radius of cell

A = 4 π R^2

A = 4 π (2.0E-5)^2 = 4 π * 4.0E-10 = 5.02E-9 m^2

A = 5.02E-9 m^2 = 5020E-6 mμ

Apparently, (b) is the answer being looked for.