The lengths of one house is not proportional to the lengths of the other house because the structure of the houses are not the same.
The scale factors can be used to show that the homes are or are not proportional. This can show that the first house doesn't have chimney and rtw second one has.
The role of the surface area take in the building of a house is that it tells us about the sum of its total area covered by the four walls.
The advantage that exist for a house with a large amount of surface area is that it gives more stability.
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