apothem

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ap·o·them

 (ăp′ə-thĕm′)
n.
The perpendicular distance from the center of a regular polygon to any of its sides.

[apo- + Greek thema, something laid down; see theme.]

apothem

(ˈæpəˌθɛm)
n
(Mathematics) the perpendicular line or distance from the centre of a regular polygon to any of its sides
[C20: from apo- + Greek thema, from tithenai to place]

ap•o•them

(ˈæp əˌθɛm)

n.
a perpendicular from the center of a regular polygon to one of its sides.
[1855–60; < French apothème]
References in periodicals archive ?
Then it is clear that as the number n of sides of the polygon increases, the apothems get closer and closer to the radius of the circle and the perimeters of the polygons get close to the circumference of the circle.
2n] are similar, so the ratio of their perimeters is in the same ratio as the lengths of their corresponding sides, which in turn are in the same ratios as the lengths of their apothems, [a.
We know that from the area of a triangle, (OT's first corollary,) we can find the area of a regular polygon, and that it is equal to 1/2 ap where a is the length of the apothem and p is the perimeter.