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Apex (geometry) : ウィキペディア英語版 | Apex (geometry)
In geometry, an apex (Latin for 'summit, peak, tip, top, extreme end;'〔(Online Etymology Dictionary )〕) is the vertex which is in some sense the highest of the figure to which it belongs. *In an isosceles triangle, the apex is the vertex where the two sides of equal length meet, opposite the unequal third side. *In a pyramid or cone, the apex is the vertex opposite the base. == References ==
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