While in sketch mode, the number displayed to the right of the cursor defines the sketch element`s exact size. therefore, there is no need to add a dimension to set the dimensional value.
a) true
b) false

B) False.

Explanation:

Most of the times, the numbers that appears right to the cursor are representing the coordinates (x & y) of the cursor. So as the cursor moves around the screen those number changes accordingly.Therefore its wrong to say that there is no need to add a dimension to set the dimensional value.