Types of angles
Angle caracteristics
Vocabulary
Other
100
What is the name of an angle that is less that 90°?
The acute angle
100
How do you show an angle?
With an arc.
100
What is a vertex?
The point at which the two sides of an angle meet.
100
What do you use to name an angle?
3 letters
200
What is the angle in which both sides make a straight line?
The straight angle. (180°)
200
What do you call the two lines of an angle?
Side
200
What tool do you use to mesure angles in degrees?
A protractor.
200
What do you call two angles that are congruent?
Vertically opposite angles
300
How many degrees is a right angle?
90°
300
If an angle is 189°, what type of angle is it?
A reflex angle
300
What are complementary angles?
Two angles have of sum of 90°.
300
What does ∠ mean?
Angle
400
What is a 360° angle called?
A full angle.
400
If you have two angles that both measure 45°, what are they called when they are added together.
Complementary
400
What are supplementary angles?
Two angles that add up to 180°.
400
∠b + ∠a = 180° If angles a and b are equal, how many degrees are they?
90°
500
What do you call an angle that is greater than 180° and less that 360°?
A reflex angle.
500
If angle A is 56° and is alternate exterior to angle B, how many degrees is angle B?
56°
500
What are vertically opposite angles?
Two angles that are opposite to each other. This usually happens when two lines intersect.
500
What are alternate interior angles?
Two angles that do not share the same vertex and lie inside two other lines on opposite sides of the transversal line are alternate interior angles
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