6-1 To 6-3

Front 1

side of a polygon

Back 1

each segment that forms a polygon

Front 2

vertex of the polygon

Back 2

common endpoint of two sides

Front 3

disgonal

Back 3

a segment that connects to any two nonconsecutive vertices

Front 4

regular polygon

Back 4

both equilateral and equiangular

Front 5

concave

Back 5

if any part of a diagonal contains points in the exterior of the polygon

Front 6

convex

Back 6

if no diagonal contains points in the exterior

Front 7

polygon exterior angle sum theorem

Back 7

the sum of the exterior angle measures, one angle at each vertex, of a convex polygon is 360 degrees

Front 8

parallelogram

Back 8

a quadrilateral with two pairs of parallel sides is a parallelogram

Front 9

theorem 6-2-1

Back 9

if a quadrilateral is a parallelogram, then its opposite sides are congruent.

Front 10

theorem 6-2-2

Back 10

if a quadrilateral is a parallelogram, then its opposite angles are congruent.

Front 11

theorem 6-2-3

Back 11

if a quadrilateral is a parallelogram, then its consecutive angles are supplementary.

Front 12

theorem 6-2-4

Back 12

if a quadrilateral is a parallelogram, then its diagonals bisect each other.

Front 13

theorem 6-3-1

Back 13

if one pair of opposite sides of a quadrilateral are parallel and congruent, then the quadrilateral is a parallelogram.

Front 14

theorem 6-3-2

Back 14

if both pairs of opposite sides of a quadrilateral are congruent, then the quadrilateral is a parallelogram.

Front 15

theorem 6-3-3

Back 15

if both pairs of opposite angles of a quadrilateral are congruent, then the quadrilateral is a parallelogram.

Front 16

theorem 6-3-4

Back 16

if an angle of a quad. is supplementary to both of its consecutive angles, then the quad. is a parallelogram.

Front 17

theorem 6-3-5

Back 17

if the diagonals of a quad. bisect each other, then the quad. is a parallelogram.