Lines and Angles

Topics in this chapter

• Lines and Angles Basics
• Angle Pairs and Relationships
• Intersecting and Perpendicular Lines
• Parallel Lines and Transversals
• Angle Bisectors
• Triangle Angle Properties
• Lines and Angles Proofs

Cheat sheet

Practice questions

1. Question 1Q-394523

   If two interior angles on the same side of a transversal intersecting two parallel lines are in the ratio 2:3, then the measure of the smaller angle is:

   1. A.54°
   2. B.72°
   3. C.108°
   4. D.36°
   See the answer and solution
2. Question 2Q-823266

   An angle is equal to five times its complement. What is the measure of this angle?

   1. A.75°
   2. B.15°
   3. C.60°
   4. D.80°
   See the answer and solution
3. Question 3Q-73C783

   The sum of all angles around a point is always equal to:

   1. A.90°
   2. B.180°
   3. C.270°
   4. D.360°
   See the answer and solution
4. Question 4Q-949985

   If lines AB, CD, and EF intersect at O, and the ratio of angles formed around O can be determined, which statement is generally true about vertically opposite angles?

   1. A.Vertically opposite angles are supplementary.
   2. B.Vertically opposite angles are equal.
   3. C.Vertically opposite angles always sum to 90°.
   4. D.Vertically opposite angles form a linear pair.
   See the answer and solution
5. Question 5Q-7EAF4B

   In a triangle, the measure of one exterior angle is 110° and one of its interior opposite angles is 40°. What is the measure of the other interior opposite angle?

   1. A.40°
   2. B.70°
   3. C.110°
   4. D.150°
   See the answer and solution