Lee Shu Hui's answer to Christine's Secondary 3 A Maths question.
done
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You can try drawing the box out and see if that helps you visualise :) great effort!
Date Posted:
7 years ago
(Assuming the lid is on, although the question was not phrased clearly if we should include the lid. It seems though, that internal implies something within, and that the box might be closed. Just my take on it. all the best!)
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