Finding theta angle.should be easy one.

[viet_jon]

finding theta angle...should be easy one.

Homework Statement

if your given theta (as pointed out by the arrow with #1), how do you know the #2 arrow angle is the same?

Homework Equations

 

[AEM]

Continue the vertical line marking one side of the angle you label 2 down until it meets the horizontal line that is A sub x extended. Now you have a right triangle. Notice that N sub B is perpendicular to the bar. The interior angles of the triangle add up to 90 and the theta you call 2 plus the upper interior angle add to 90 so the two thetas have to be equal.

Is that clear?

 

[viet_jon]

wickd! got it...thankx, cheers!