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definitions for proofs
9
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9th Grade
11/18/2009

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Term
perpendicular
Definition
if two lines are perpendicular, then they intersect to form 4 right angles
Term
right angle
Definition
if an angle is a right angle, then its measure is 90 degrees
Term
complementary angles
Definition
if two angles are complementary, then the sum of their angle measure is 90
Term
supplementary angles
Definition
if two angles are supplementary, then the sum of their angle measures is 180
Term
midpoint
Definition
if a point is the midpoint of a segment, then it divides the segment into two equal parts. OR if B is the midpoint of AC, then 1)B is between A and C and 2)AB=BC
Term
bisector
Definition
if a ray bisects an angle, then the angle is divided into two equal parts
Term
linear pair
Definition
if two angles are adjacent and their non-common sides are opposite rays then they form a linear pair
Term
vertical angles
Definition
if two sides of two angles form two pairs of opposite rays, then the angles are vertical angles
Term
substitution
Definition
if a=b, then each may replace the other
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