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For any pair of parallel lines 1 and 2, that are both intersected by a third line, such as line 3 in the diagram below, angle A and angle D are called alternate interior angles. Alternate interior angles have the same degree measurement.
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www.mathleague.com/help/geometry/angles.htm
www.mathleague.com/help/geometry/angles.htm
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Definition and properties of alternate interior angles, showing the pairs of angles associated with a transversal ... In the figure above, click on 'Other angle pair' to visit both pairs of alternate interior angles in turn. Remember: interior means inside the parallel lines.
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www.mathopenref.com/anglesalternateinterior.html
www.mathopenref.com/anglesalternateinterior.html
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In the drawing below, angles 3 and 6 are alternate interior angles, as are angles 4 and 5. Alternate interior angles are congruent. Formally, alternate interior angles are two interior angles which lie on different parallel lines and on opposite sides of a transversal.
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www.mathwords.com/a/alternate_interior_angles.htm
www.mathwords.com/a/alternate_interior_angles.htm
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Theorem 9.1:[Alternate Interior Angle Theorem] If two lines cut by a transversal have a pair of congruent alternate interior angles, then the two lines are non-intersecting.
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math.uncc.edu/~droyster/math3181/notes/hyprgeom/node33....
math.uncc.edu/~droyster/math3181/notes/hyprgeom/node33.html
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<= Assume alternate interior angles of the intersections of L and T, M and T are congruent and prove L and M are parallel. ... We want to show that angle A'AB is congruent to ABB'' and that angle ABB' is congruent to BAE. Since L and M are parallel, by the corresponding angles theorem, DAA' is congruent to angle ABB'.
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jwilson.coe.uga.edu/EMAT6680/Dunbar/Math7200/ParallelLi...
jwilson.coe.uga.edu/EMAT6680/Dunbar/Math7200/ParallelLines/parallel_altint.htm
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Geometry Question: What Is An Alternate Interior Angle? You need to have two parallel lines and a line called a transversal that crosses over the two parallel lines. Then you have two pairs of Alternate ... What Is An Interior Angle In Geometry? ... Then you have two pairs of Alternate Interior Angles. Interior means the four...
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www.blurtit.com/q9500962.html
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A pair of angles on the inner sides of two lines cut by a transversal, but on opposite sides of the transversal ... 3 and 6 and 4 and 5 are alternate interior angles.
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www.harcourtschool.com/glossary/math_advantage/definiti...
www.harcourtschool.com/glossary/math_advantage/definitions/alternate_i8.html
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I know what an alternate interior angle is, but not an exterior one. I am completly clueless! Please help, A.S.A.P.! Thanks------ S.B. ... (You may see those words on paint can labels, for example.) So alternate _interior_ angles are on opposite sides of the transversal, _between_ the parallel lines, like the pair of x's...
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mathforum.org/library/drmath/view/60766.html
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Defines what is meant by 'interior of an angle' ... Try this Drag an orange dot. The point K will indicate if it is within the interior of angle ∠ABC (shown in yellow). Or, drag the point K. ... Alternate interior angles...
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www.mathopenref.com/angleinterior.html
www.mathopenref.com/angleinterior.html
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