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alternate angles
plural noun
, Geometry.
- two nonadjacent angles made by the crossing of two lines by a third line, both angles being either interior or exterior, and being on opposite sides of the third line.
alternate angles
plural noun
- two angles at opposite ends and on opposite sides of a transversal cutting two lines
alternate angles
- Two angles formed on opposite sides of a line that crosses two other lines. The angles are both exterior or both interior, but not adjacent.
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Word History and Origins
Origin of alternate angles1
First recorded in 1650–60
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Example Sentences
Frustules oblong or quadrate, adnate in filaments, attached by alternate angles and finally separating.
From Project Gutenberg
We may now state Prop. 16 thus:—If two straight lines which meet are cut by a transversal, their alternate angles are unequal.
From Project Gutenberg
And “if the lines are parallel, are alternate angles necessarily equal?”
From Project Gutenberg
That is to say, “If alternate angles are unequal, do the lines meet?”
From Project Gutenberg
If two straights make with a transversal equal alternate angles they have a common perpendicular.
From Project Gutenberg
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