Parallel lines never meet; perpendicular lines meet at exactly 90°.
Grade 4Common Core 4.G.A.1GVerified correct ✓
Worked examples
Two parallel lines are cut by a transversal. One co-interior (same-side interior) angle measures 153°. What is the measure of the other co-interior angle? Answer: 27
Two parallel lines are cut by a transversal. One co-interior (same-side interior) angle measures 54°. What is the measure of the other co-interior angle? Answer: 126
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Master Parallel and Perpendicular Lines
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