Lines and Angles
Lines
Horizontal A line going ro side to side
Vertical A line going from top to bottom
Oblique 2 diagonal lines crossing 
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Related Lines
Parallel lines two lines side by side that never intersect
Perpendicular Lines are perpendicular lines if the are 90 degrees from each other.
More On lines , A Line segment
Ray
Angles An Angle is when two lines meet
Reflex >180°- <360°
Acute less than 90°
Right 90°
Obtuse >90-<180
Straight 180°
Arms are connected to the vertex
A vertex is a point between 2 arms
A complementary angle are 2 angles that at up to 90 degrees
A supplementary angle is when 2 angles add up 2 180 degrees
When two lines cross each other, the opposite angles are equal
when three lines meet at one point, the angles they make add up to 360 degrees