Graphical Four Bar Linkage question

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Homework Statement
In a four-bar mechanism, the length of crank AB-15 mm, length of coupler BC-40 mm. length of rocker CD-30 mm, and length of frame DA=45 mm. Graphically determine the following.(1)The throw yof rocker CD,
(2)The maximum value of pressure angle a., and(3) The time ratio.
Relevant Equations
nil
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How the instantaneous position of the mechanism can be determined from the description?
 

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