: either of the angles of a triangle that have one side in common with the base
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These measurements vary systematically from person to person — in skull base angle, maxillary depth and pharyngeal cavity volume — and that even small structural differences produce perceptible shifts in the formant signature a voice carries.—Scott Travers, Forbes.com, 21 May 2026 It has been divided into two triangles by bisecting the base angle on the left side.—Quanta Magazine, 20 Nov. 2020