• handy ⪢⪢
If something is _____ , it is useful.
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• handy ⪢⪢
An eraser is handy if you make a lot of mistakes.
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○○○ ψ ≈ 137.5° ⪢⪢
As angles smaller than 180° proved to be more handy in practice, the smaller of the resultant angles is usually called golden angle. #math
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