what lenght of nichrome wire of radius 0.5 mm has a resistance of 8.50 ohms? note: nichrome resistivity is?

Question

my reference table is showing 150. x 10^-8.

Thank you for the help.

Answer 1

R= p L/A
A= pi r^2

L= R A /p
L= R pi r^2 /p
L= 8.50 x pi (0.5 E-3)^2/ 150 E -8 =
L=4.45m