Angles Flashcards
What is an angle?
An angle is formed by two rays that share a common endpoint called the vertex.
What is the unit of measurement for angles?
The unit of measurement for angles is degrees (°).
What is a right angle?
A right angle measures exactly 90 degrees.
True or False: An acute angle measures more than 90 degrees.
False.
What is an obtuse angle?
An obtuse angle measures more than 90 degrees but less than 180 degrees.
Fill in the blank: A straight angle measures _____ degrees.
180
What do you call an angle that measures exactly 360 degrees?
A full angle.
True or False: Complementary angles add up to 180 degrees.
False.
What are complementary angles?
Complementary angles are two angles that add up to 90 degrees.
What are supplementary angles?
Supplementary angles are two angles that add up to 180 degrees.
If one angle is 30 degrees, what is its complement?
60 degrees.
If one angle is 120 degrees, what is its supplement?
60 degrees.
What is a vertical angle?
Vertical angles are angles opposite each other when two lines intersect; they are equal.
True or False: Adjacent angles share a common vertex and a side.
True.
What is the sum of angles in a triangle?
The sum of angles in a triangle is always 180 degrees.
What is a reflex angle?
A reflex angle measures more than 180 degrees but less than 360 degrees.
Fill in the blank: Angles that are formed by two intersecting lines are called _____ angles.
vertical
What is the relationship between angles formed by parallel lines and a transversal?
Corresponding angles are equal, alternate interior angles are equal, and same-side interior angles are supplementary.
True or False: An angle measuring 45 degrees is an obtuse angle.
False.
What is the measure of a full rotation?
360 degrees.
What type of angle is 15 degrees?
An acute angle.
What type of angle is 90 degrees?
A right angle.
If two angles are supplementary and one angle measures 70 degrees, what is the measure of the other angle?
110 degrees.
What is the term for angles that are equal in measure?
Congruent angles.
Fill in the blank: An angle measuring 270 degrees is a _____ angle.
reflex
What do you call the point where two rays meet to form an angle?
The vertex.
True or False: An angle can be measured in radians.
True.
