Definition of apothem in US English: apothem
noun Geometry A line from the center of a regular polygon at right angles to any of its sides.
Example sentences
‘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.’ ‘Once the perimeter and the apothem are known, the formula relating the two to area can be used to solve for the area.’ ‘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.’ Origin Late 19th century: from Greek apotithenai ‘put aside, deposit’, from apo ‘away’ + tithenai ‘to place’.
Pronunciation apothem /ˈæpəˌθɛm/ /ˈapəˌTHem/