
Geometry
Alternate Angles Worksheets
Find two missing alternate interior angles on marked parallel-line diagrams, with whole degrees, tenths or hundredths.
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Use matching positions at parallel-line intersections to find missing corresponding angles, with three precision options.
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Find the two missing angles. Corresponding angles have equal measures when the marked lines are parallel.
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Customize this worksheetCorresponding angles occupy the same relative position at the two intersections, so their measures are equal when the lines are parallel.
Learning objective
Recognize corresponding positions and transfer an angle measure across parallel lines.
Worked example
72.25 degrees.
Corresponding angles on parallel lines are equal, so angle 2 = angle 3 = 72.25 degrees.
Teaching notes
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Six parallel-line diagrams each give one angle from both corresponding equality pairs and ask for their direct partners. Both transversal slopes appear.
A useful next step

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Find two missing alternate interior angles on marked parallel-line diagrams, with whole degrees, tenths or hundredths.
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Use two adjacent givens in 6 or 8 intersecting-line diagrams to find both opposite unknowns. Four numbered regions, whole-number or decimal precision and a two-mark answer key make every equality explicit.
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