Question

Which one of the following is not a unit of length ?
(a) angstorom
(b) light year
(c) fermi
(d) radian​

Answer 1

none of these...... .... .......

Answer 2

Explanation:

Radian is not a unit of length but is equal to the ratio of length of the enclosed arc to the length of the circle's radius.

Hope it helps you...