Chapter 5: Lines and Angles

Questions

1. Supplement of $115^\circ$.
2. If two co-interior angles on parallel lines are $(2x)^\circ$ and $(3x+20)^\circ$, find $x$.
3. Prove: vertically opposite angles are equal (short reason).
4. Complement of $37^\circ$.
5. Supplement of $110^\circ$.
6. Alt interior angle of $55^\circ$ on parallel lines.
7. Vertically opposite of $80^\circ$.
8. Two co-interior angles on parallel lines are $110^\circ$ and $x$: find $x$.
9. Sum of angles in a linear pair.
10. If two angles are supplementary and one is $2/3$ of the other, find them.

Extra Practice (Optional)

• Angles $45^\circ$ and $x^\circ$ are complementary: find $x$.
• If $\ell \parallel m$ and one corresponding angle is $110^\circ$, others?
• Two lines perpendicular to the same line are $\ldots$?