Why is Mohr's circle labeled clockwise and not anticlockwise?

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Homework Statement

a.)why the angle θ p is in clockwise direction? why shouldn't it be in anticlockwise direction?

b.) I have labelled A,B ,C and D...Why the maximum normal stress is labelled at location A? while the min stress is labelled at location B?
Can I label the min and max stress at other location? Say, max stress a t C , min stress at D? I don't understand why the the author label the max and min stress in that way...

Homework Equations

The Attempt at a Solution

 

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