Test
Parallel lines and angles
Dynamic tasks on corresponding, alternate interior and same-side interior angles, including comprehension of geometric relationships.
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Sample questions
- A transversal crosses two parallel lines. One corresponding angle is ___°. Find the other corresponding angle.
- One alternate interior angle is ___°. Find the equal alternate interior angle. The lines are parallel.
- One same-side interior angle is ___°. Find the other same-side interior angle.
- Same-side interior angles are (x + ___)° and x°. Their total measure is ___°. Find x.
- Which statement about corresponding angles formed by parallel lines is always true?
Parallel lines and angles
When a transversal crosses parallel lines, corresponding and alternate interior angles are equal, while same-side interior angles total 180°. These relationships determine angles without measurement.
Working method
Mark the known angle, identify its relationship with the unknown and then use equality or supplementation to 180°. Vertically opposite angles at an intersection are also equal.
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