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A line from the centre of a regular polygon at right angles to any of its sides.
- ‘Given a circle, the apothem is the perpendicular distance from the midpoint of a chord to the circle's center.’
- ‘For a polygon of n sides, there are n possible apothems, all the same length of course.’
- ‘In a regular polygon, we have an apothem, a number and a length of sides which do not belong to the base class shape.’
- ‘We can find the apothem from the side length and the number of sides.’
- ‘Once the perimeter and the apothem are known, the formula relating the two to area can be used to solve for the area.’
Late 19th century: from Greek apotithenai ‘put aside, deposit’, from apo ‘away’ + tithenai ‘to place’.
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