the.com/hypotenuse

The long side that shows up whenever you cut a corner honestly.

means The longest side of a right triangle, sitting opposite the right angle.

from From Greek 'hypoteinousa,' meaning 'stretching under,' built from 'hypo-' (under) and 'teinein' (to stretch). The Greeks pictured this side as the one literally stretched beneath the right angle, subtending it like a rope pulled taut under a corner. The word entered Latin as 'hypotenusa' and passed into English largely unchanged, carrying its geometry lesson in its own syllables.

definition
Longest side of a right triangle, opposite the right angle
formula
a squared plus b squared equals c squared
etymology
Greek for stretching under
real use
Shortest path between two points, diagonally
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