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What does no less than mean in math?
More than or equal to.
Why the area of sharpened edges of knives axes and tips of pins nails are kept less?
they are kept less so as to make them more sharp-edged, to increase the effect of force. so less area makes more pressure.
What is symbol for more or less?
It depends on what you mean by "more or less". If more or less is used to indicate approximately or nearly equal to, then the symbol used is ≈ which look like a wriggly equals symbol. If more or less is used for more than or less than but not equal to, then you would use an equals sign with a diagonal line through it ≠ which stands for "not equal to" You are right but if it's more than or less than it would look like this (less than)<(more) or (more than)>
What does used less mean?
It simply means that something is used less, as opposed to being used more. For instance: Filament bulbs are used less in battery torches, nowadays, as LEDs have proved more efficient.
What does obtuse mean in mathematics?
(of an angle) more than 90° and less than 180°.
