Identify the ‘a’ in the given picture

From below given figure, match the following.

Identify the type and system of dimensioning in the example given below.

Dimension lines should be drawn at least ____mm away from the outlines and from each other.

From unidirectional system, it is ______

Which of the following dimension needs to be calculated?

The line given below is used for____________

Medium thickness, line-group of 2mm are not used for _____