Geometry

Front 1

definition of a segment bisector

Back 1

segment bisector intersects a segment at it midpoint

Front 2

reverse definition of a segment bisector

Back 2

any line that intersects a segment at its midpoint is the segment bisector

Front 3

definition of a midpoint

Back 3

midpoint divides a segment into 2 congruent segments

Front 4

Reverse definition of a midpoint

Back 4

any point that divides a segment into 2 congruent segments is the midpoint

Front 5

Definition of an angle bisector

Back 5

angle bisector divides an angle into 2 congruent angles

Front 6

Reverse definition of an angle bisector

Back 6

any ray that divides an angle into 2 congruent angles is the angle bisector

Front 7

definition of perpendicular lines

Back 7

peropendicular lines intersect to form right angles

Front 8

reverse definition of perpendicular lines

Back 8

any two lines that intersect to form right angles are perpendicular

Front 9

definition of complementary angles

Back 9

complementary angles are 2 angles that unite to form a right angle

Front 10

reverse definition of complementary angles

Back 10

any 2 angles that unite to form a right angle are complementary

Front 11

definition of supplementary angles

Back 11

supplementary angles are 2 angles that unite to form a straight line

Front 12

reverse definition of supplementary angles

Back 12

any two angles that unite to form a straight line are supplementary

Front 13

Supplementary (same angle)

Back 13

supplements of the same angle are congruent

Front 14

Supplementary (congruent angles)

Back 14

supplements of congruent angles are congruent

Front 15

Complementary (same angle)

Back 15

complements of the same angle are congruent

Front 16

Complementary (congruent angles)

Back 16

complements of congruent angles are congruent

Front 17

Postulate
(parallel lines to corresponding angles)

Back 17

If parallel lines, then corresp. angles are congruent

Front 18

Theorum
(parallel lines to alt. int. angles)

Back 18

If parallel lines, then alt. int. angles are congruent

Front 19

Theorum
(parallel lines to same side int. angles)

Back 19

If parallel lines, then same side int. angles are supplementary

Front 20

Theorum
(Perp. line to one of two parallel lines)

Back 20

If a line is perpendicular to 1 or 2 parallel lines, then it's perp. to the other as well.

Front 21

5 ways to prove lines are parallel

Back 21

1. If corresp. angles are congruent, then lines are parallel
2. if alt. int. angles are congruent, then lines are parallel
3. if same side int. angles are supp, then the lines are parallel
4. Two lines perp. to the same line are parallel
5. Two lines parallel to a 3rd line are parallel to each other