Now the position of this line, as found by Kobold, actually is a (properly weighted) mean between the corresponding lines of symmetry of the two drifts, but naturally it lies in the acute angle between them, whereas the line of the solar motion is also a weighted mean between the two lines of drift, but lies in the obtuse angle between them.

The difference between an acute angle and a right angle is termed the complement of the angle, and between an angle and two right angles the supplement of the angle.

Successive halfturns about intersecting axes a, b are equivalent to a rotation about the common perpendicular to a, b at their intersection, Of amount equal to twice the acute angle between them, in the direction from a to b.

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In the case of a biaxal plate perpendicular to the bisector of the acute angle between the optic axes, the curves of constant retardation are approximately Cassini's ovals, and the lines of like polarization are equilateral hyperbolae passing through the points corresponding to the optic axes.

Jaw formed of folds imbricated externally and meeting at an acute angle near the base.

But we withdrew at an acute angle not only because the French advanced between our two armies; the angle became still more acute and we withdrew still farther, because Barclay de Tolly was an unpopular foreigner disliked by Bagration (who would come under his command), and Bagration--being in command of the second army--tried to postpone joining up and coming under Barclay's command as long as he could.