Revision of Straight Line Geometry

What is a complementary angle

Angles that add up to 90 degrees

What are adjacent angles

Angles that share a common vertex and arm.

What would complementary angles add up to?

90 degrees

What is a supplementary angle?

An angle that adds up to 180 degrees

What would adjacent supplementary angles add up to?

180 degrees

Give a property and reason for adjacent angles on a straight line.

They add up to 180 degrees.[Adj angl’s on a str. line]

Give a property for vertically opposite angles.

They’re equal.[vert. opp angl’s]

Give a property and reason for angles round a point

They add up to 360 degrees[Angl’s round a pt.]

What is a corresponding angle and give a reason.

Corresponding angles are pairs of equal angles in the same relative position at each intersection where a straight line (transversal) crosses two other lines..[corresp angl’s; xy II ab]

What are alternating angl’s and give a reason.

Alternate angles are pairs of angles on opposite sides of a transversal line that intersects two other lines[alt angl’s ; xy II ab]

What are co-interior angles and give a reason.

Co-interior supplementary angles are pairs of angles found between two parallel lines, intersected by a third line (called a transversal), that lie on the same side of that transversal.[co-int angl’s ; XY II AB]