Angle Relationships. 90 degree angle:. 180 degree angle:. 90 and 180 degree angles……. Acute – angles less than 90 degrees. Right – angles with exactly 90 degrees. Types of angles……. Obtuse – angles greater than 90 degrees but less than 180 degrees.
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Straight – angles that are 180 degrees and form a line.
The symbol for perpendicular is an upside down T.
Vertical Angles are congruent. (Equal)Vertical Angles……
Linear Pair – a pair of adjacent angles whose non-common sides form opposite rays.
∠1and ∠2form a linear pair.
add up to 180 degrees.