By: Tristian Whigham
Angles which measure exactly 180° (degrees) are straight angles. Therefore, straight angles are straight lines. Angles are represented by the sign ϴ, called theta. That is, for straight angles, ϴ= 180°.
Angles that are exactly at 90°
Angles that are more than 90° but less than 180°
Angles that are more than 180° but less than 360°
Angles that share the same vertex, and have a common side
When two angles add up to 90°
When two angles add up to 180°
Vertically Opposite Angles
Vertically opposite angles are the angles opposite to each other when two straight lines intersect. Their defining property is that, vertically opposite angles are equal in magnitude.
When two parallel lines are crossed by a line called the transversal, the angles formed which are in corresponding positions, are called corresponding angles. Corresponding angles are equal in magnitude.