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Which of the following could not be used as a straightedge? A banana A ruler The edge of a book An edge of a piece of cardboard

2 Answers

4 votes
I am assuming that a banana cannot be used as a straightedge. 
User AllJs
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1 vote
A. Banana because its curved a straightedge is somethin straight to test if something else is straight like ruler the edge of a book etc.
User RITZ XAVI
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