Asurface area of a sphere can be approximated as follows: surface area=4r^2 where the radius of the sphere is a constant that is roughly equal to 3 using the simple approximation above, calculate the surface area of a sphere with a radius of 2

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.