SI unit analysis to show that equation A=4pi Rsquared, A=area and R=radius of a sphere is dimentionally correc

Question

Thank you. Didn't have many characters to work with so sorry if it's a bit unclear. Basically By using SI unit analysis I need to know if that equation is dimentionally correct.

Answer 1

A is in meters-squared
R is in meters

4 and pi are dimensionless constants

A [meters-squared] = 4pi * R^2 [meters]^2

[meters-squared] = [meters-squared]

.

Answer 2

correct.
area = length x length =4 x pi x radius(length) x radius(length)

pi is a ratio and has no unit.