Pre - Algebra

Types of angles

o   Acute angle

An acute angle is an angle whose measure is less than 90 degrees.

o   Right Angle

A right angle is an angle whose 90 degrees.

o   Obtuse Angle

An obtuse angle is an angle whose measure is bigger than 90 degrees but less than 180 degrees.

o   Straight Angle

A straight angle is an angle whose measure is bigger than 180 degrees.

o   Reflex Angle

An angle whose measure is bigger than 180 degrees but less than 360 degrees.

o   Adjacent Angle

An adjacent angle is an angle with a common vertex and one common side.

o   Supplementary Angle

Supplementary angles that have two angles whose measure have 180 degrees.

o   Complementary Angle

A supplementary angle that has two angles whose measures add to 180 degrees.

o   Vertical Angle

Are angles that have a common vertex and whose sides are formed by the same lines.

o   Alternate Interior Angles

Are pairs of interior angles on opposite sides of the transversal.

o   Alternate Exterior Angles

Are pairs of exterior angles on opposite sides of the transversal.

o   Corresponding Angles

Corresponding angles are pairs of angles that are in similar positions.