AB and EF are the first two letters of ABCD and EFGH respectively. Therefore, these two sides correspond and pair up. They are the horizontal sides
AB = 4
EF = 8
Divide the two values
AB/EF = 4/8 = 1/2 = 0.5
We will use this value later so keep it in mind.
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The sides AD and EH also pair up (and correspond). This is because the letters A & D are the first and last letters of ABCD. Same applies for E & H being the first and last letters of EFGH
AD = 2
EH = 6
Divide: AD/EH = 2/6 = 1/3 = 0.33 approx
Since we did not get 1/2 = 0.5 like we did above, this means that the sides are not in proportion to one another. Meaning that the rectangles are not similar.
So the equation AB/EF = AD/EH, which turns into 4/8 = 2/6, is not a true equation.
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Answer: The rectangles are not similar