Suppose abcd is a rectangle. find ab and ad if point m is the midpoint of bc , am ⊥ md , and the perimeter of abcd is 34 in.

See the attached figure to better understand the problem

we know that
AM=MD
so
triangle AMD is an isosceles right triangle
therefore
its height is half its width.
Then
AB = (1/2)AD----------Equation 1
Perimeter=2*[AB+AD]=34 in ---------> AB+AD=17-------> Equation 2

I substitute 1 in 2
(1/2)AD +AD = 17 
(3/2)AD=17
AD=17*2/3----------> AD=34/3-------> 11 1/3 in
AB=(1/2)AD--------> AB=(1/2)*34/3--------> AB=17/3-------> AB=5 2/3 in

the answers are
AD=11 1/3 in
AB = 5 2/3 in

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