Geometry Terms
Terms
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- complementary theorem
- complements of the same angle are equal
- linear pair theorem
- the angles in a linear pair are supplementary
- straight angle
- angles that equal 180
- vertical angles theorem
- vertical angles are equal
- linear pair
- two angles that have commen sides and their other sides are opposite rays
- betweeness of points theorem
- if A-B-C, then AB+BC=AC
- midpoint of a line segment
- a point that divides the line segment with two equal segments
- supplmentary theorem
- supplements of the same angle are equal
- corollary to the protractor postulate
- an angle has exactly on ray that bisects it
- corollary to the definition of a right angle
- all right angles are equal
- division property
- if a-b and c is not equal to 0 then a/c= b/c
- substitution property
- if a=b, then a can be substituted for b in any expression
- betweeness of rays theorem
- of OA-OB-OC, then angle AOB+ angle BOC= AOC
- corollary to the ruler postulate
- a line ssegment has exactly one midpoint
- addition property
- if a=b, then a-c=b-c
- ruler postulate
- the points on a line can be numbered so that positive number differences measure distances
- betweenness of rays
- a ray is between two others in the same half-rotation
- betweeness of points
- a point is between two other points on the same line
- obtuse angle
- angles greater than 90 but less than 180
- multipication property
- if a=b, then ac=bc
- reflexive property
- a=a (any number is equal)
- acute angle
- angles less than 90
- vertical angles
- two angles that the sides of one angle are opposite rays to the sides to the other
- bisects an angle
- a line that divides the angle into two equal angles
- supplementary
- iff there sum is 180
- right angle
- angles that equal 90
- perpindicular theorem
- perpindicular lines form four right angles
- corallary
- is a theorem that can be easily proved as a consequence of a postulate or another theorem
- protractor postulate
- the rays in a half-rotation can be numbered from 0 to 180 so that positive number differences measure angles
- complementary
- iff there sum is 90
- perpindicular
- iff they form a right angle