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Homework Statement
This is a question from my physics book, i don't understand its solution.
Consider a square hole in an aluminum plate (2D) . If this block is heated,
will this hole become smaller or larger ?
Homework Equations
δL/L = β*δT
The Attempt at a Solution
As each of the side of the block expands (some a lttle, while the longer sides more) thus the area decreases.
But, the answer as given by the book is that the area would increase.
Can anyone help me understand this ?