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# Lines and Angles

### lines and angles

Point is an exact position on a plane surface
Line is a set of points in a straight path that extends in opposite directions without ending
Line Segment is a part of a line between 2 end points
Ray is a part of a line that has 1 end point and extends in one direction without ending
Parallel lines 2 lines are parallel if they never cross and remain distances apart no matter how far they are extended
Perpendicular Lines 2 lines are perpendicular if they are right angles (90*) to each other
Angle Whenever lines meet we say they intersect. The point where lines meet is called an intersection or vertex
Acute angle Less than 90* smaller than a right angle
Right angle exactly 90*
Obtuse angle greater than 90* but smaller than 180* bigger than a right angle
Straight angle exactly 180*
Reflex angle greater than 180* but less than 360* bigger than a right angle
Revolution angle full 360*
Complementary angles two angles are complementary when they add up to 90* a (right angle) they don't have to be next to each other, just as long as the total is 90*
Supplementary angles two angles are complementary when they add up to 180* they don't have to be together, just as long as they add up to 180*
Vertically opposite angles are the angles opposite of each other when 2 lines intersect "vertical" in this case means they share the same vertex, not the usual meaning of up-down vertically opposite angle are equal
Angles at point angles around a point will always add up to 360*
Created by: dayekayl