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Angles & Parallel Lines Worksheet

Grade 8 Math · printable worksheet (PDF) with answer key · 14 problems · CCSS 8.G.A.5

A printable grade 8 angles & parallel lines practice worksheet with 14 problems and a complete, step-by-step answer key — formatted to print cleanly on standard paper. Included in the one-time $20 unlock for the full NudgeLearn library.

Sample problems

Use angle facts to find each unknown. When two parallel lines are cut by a transversal: corresponding angles are equal, alternate interior angles are equal, and same-side interior angles add to $18 0^{\circ}$ . In any triangle the three angles add to $18 0^{\circ}$ , and an exterior angle equals the sum of the two remote interior angles.

1. Lines $m$ and $n$ are parallel. Find the value of $x$ .
2. Two straight lines cross. One of the four angles is $11 0^{\circ}$ . Find $x$ , the measure of the angle directly opposite it (its vertical angle).
3. Lines $m$ and $n$ are parallel. Find the value of $x$ .
4. Lines $m$ and $n$ are parallel. Find the value of $x$ .

Plus 10 more problems and a full answer key in the PDF.

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