How to Calculate Reactions and Forces in a Pin Jointed Frame?

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To calculate reactions and forces in a pin-jointed frame, it's essential to apply the three equations of static equilibrium: the sum of vertical forces equals zero, the sum of horizontal forces equals zero, and the sum of moments equals zero. The user is struggling with determining the reactions at points A and E, as well as the forces in the members. They have identified one reaction value (VA as 10) but are confused about the remaining unknowns. Clarification on the third equation of equilibrium is crucial for progressing in the calculations. Understanding these principles will enable accurate analysis of the frame's forces.
warrio1010
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Homework Statement
[PLAIN]http://img847.imageshack.us/img847/1704/pinjointed.png
Calculate the reactions at A and E and the forces in all members.

The attempt at a solution

At a loss regarding the reactions, tried equating vertical and horizontal.
As for the members I guess its just a case of working from the reaction values and using sin and cos but also can't get my head around this.

Any methods/pushes in the right direction much appreciated.
 
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In 2-dimensional work, as this one is, how many equations are there of static equilibrium? And what are they?
 
sum of v=0 and sum of horiz=0
?
 
Don't forget the sum of the moments = 0.
 
I have VA as 10 but can't work out the other two, the equation would suggest that HE-HA+5=0 which leaves two unknowns so I'm stuck with that.
 
You are forgetting about the 3rd equation of equilibrium alluded to in the prior responses.
 

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