For a four bar linkage with r1 6in r2 3 in r3 4in r4 4

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For a four bar linkage with r1 = 6in, r2 = 3 in, r3 = 4in, r4 = 4 in and initially in a non-crossed configuration (open),

a) find all the interior angles when θ1 = 25° and when θ2 = 170°.

b) reconsider using a vector based approach to find the angles of links 3 and 4 relative to the horizontal when θ2 = 45°.

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