Virtual Work - Determining Relations

[CivilSigma]

Homework Statement

Hello, I'm having problems determining the relationships between delta a and delta c . I don't see how how delta C = 4/9 delta A
[/B]
http://imgur.com/a/B6eTx

Thank you.

 

[SteamKing]

Homework Statement

Hello, I'm having problems determining the relationships between delta a and delta c . I don't see how how delta C = 4/9 delta A
[/B]
http://imgur.com/a/B6eTx

Thank you.

What change in position do you get at points A and C when linkage ABC rotates by a small angle δθ? Remember, point B is fixed.