Chapter 10: Basic Geometry

Vocabulary flashcards covering angle classifications and geometric angle relationships from Chapter 10: Basic Geometry.

Complementary Angles

Two angles whose measures add up to $90^\circ$.

Supplementary Angles

Two angles whose measures add up to $180^\circ$.

Right Angle

An angle that measures exactly $90^\circ$.

Obtuse Angle

An angle greater than $90^\circ$ but less than $180^\circ$.

Straight Angle

An angle that measures exactly $180^\circ$.

Full Rotation

An angle or turn that measures exactly $360^\circ$.

Reflex Angle

An angle that measures more than $180^\circ$.

Corresponding Angles

Angles located in matching corner positions when two parallel lines are cut by a transversal; they are equal only when the lines are parallel.

Alternate Interior Angles

Angles formed by a transversal on parallel lines that lie between the parallel lines on alternate sides; they are always equal.

Alternate Exterior Angles

Angles that lie on opposite sides of the transversal, outside the parallel lines; they are equal.

Vertically Opposite Angles

Angles directly opposite one another when two lines intersect or cross; they are always equal.

Co-interior Angles (Allied Angles)

Angles on the same side of a transversal, between two parallel lines; they are always supplementary.