Explain why the lengths of the corresponding sides of rectangles ABCD and EFGH vary proportionally. I cant post the picture of the triangles but the length of the first triangle DA=44 and the width AB=88. The second triangles length HE=35 and width EF=70

they both have length which is twice the width, so they are similar.

comparing 1st to 2nd,

width/width = length/length
44/35 = 88/70