5 terms

Angle Theory

Vertically Opposite Angles
Vertically opposite angles are equal.
Alternate Angles
Alternate angles are equal.
Corresponding Angles
Corresponding angles are equal.
Co-interior Angles
Co-interior angles are supplementary. Their angle measures add up to 180º.
Linear Pair
Angles next to each other forming a line
always add up to 180º. They are supplementary.