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3 cards from this section. Quick, good the night before a test.
Define an angle.
Think about rays and their connection.
What is a right angle?
Recall the angles in a square.
What is the measure of an acute angle?
Think about the scale of angles.
True or False: Vertically opposite angles are always equal.
Visualize intersecting lines.
If two lines intersect at an angle of 40°, what are the measures of the other three angles formed?
Use properties of vertically opposite angles.
Prove that if two interior angles on the same side of a transversal sum to 180°, then the two lines are parallel.
Start with the given properties of the angles.
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