# data[].attributes.headline
 sides of a parallelogram are congruent 

# data[].attributes.subject
 sides of a parallelogram are congruent 

# data[].attributes.body
the nonparallel sides are congruent

# data[].attributes.headline
Opposite sides  of a parallelogram are parallel 

# data[].attributes.subject
Opposite sides  of a parallelogram are parallel 

# data[].attributes.headline
Show that it is a parallelogram with perpendicular diagonal

# data[].attributes.subject
Show that it is a parallelogram with perpendicular diagonal

# data[].attributes.body
(use only if it says its originally a parallelogram)  (Find the slopes of the diagonals)

# data[].attributes.headline
Show that it is a rhombus by showing all four sides are congruent.

# data[].attributes.subject
Show that it is a rhombus by showing all four sides are congruent.

# data[].attributes.body
All four sides are congruent.

# data[].attributes.body
2 pair adjacent sides are congruent.

# data[].attributes.headline
Show that it is a parallelogram one pair of consecutive sides that are congruent

# data[].attributes.subject
Show that it is a parallelogram one pair of consecutive sides that are congruent

# data[].attributes.body
(Use only if it says its originally a parallelogram) (Use distance formula twice)

# data[].attributes.headline
Show that it is a parallelogram one pair of consecutive sides that are congruent

# data[].attributes.subject
Show that it is a parallelogram one pair of consecutive sides that are congruent

# data[].attributes.body
four90 degree angles

# data[].attributes.body
4 90 degree angles

# data[].attributes.body
Both pairs of opposite sides are parallel

# data[].attributes.body
consecutive angles are supplementary

# data[].attributes.body
both pairs of opposite angles are congruent.

# data[].attributes.headline
Show that the quadrilateral has four equal sides 

# data[].attributes.subject
Show that the quadrilateral has four equal sides 

# data[].attributes.body
(Use in any situation)

# data[].attributes.headline
Show that the quadrilateral has four equal sides 

# data[].attributes.subject
Show that the quadrilateral has four equal sides 

# data[].attributes.body
(Use  in any situation) (Use distance formula four times)

# data[].attributes.headline
Show that the quadrilateral has four congruent sides.

# data[].attributes.subject
Show that the quadrilateral has four congruent sides.

# data[].attributes.body
All four angles are right angles

# data[].attributes.body
both pairs of base angles are congruent

# data[].attributes.body
other diag. forms 2 congruent triangles

# data[].attributes.body
Consecutive angles are supplementary

# data[].attributes.body
the diagonals are congruent

# data[].attributes.body
4 sided polygon

# data[].attributes.body
4 sided polygon
Sum of interior angles is 360 degrees
Opposite sides are parallel and congruent
Opposite angles are congruent
Consecutive angles supplementary
Diagonals bisect eachother
Diagonals form congruent triangles
Parallelogram
Diagonals are congruent
Is a Quadrilateral and a Parallelogram

# data[].attributes.body
Diagonals bisect each other

# data[].attributes.body
1 diag. forms 2 isosceles triangles

# data[].attributes.attachment_link.description
Paralelogram ili pačetvorina je četverougao s dva para paralelnih i sukladnih suprotnih stranica. Drugim riječima, to je presjek dviju pruga. Naspramni ugalovi su također sukladni. Dijagonale (obično označene s e, kraća, i f, duža) se prepolavljaju (sjecište dijagonala je polovište svake dijagonale). Trodimenzionalna analogija paralelogramu jest paralelepiped.

# data[].attributes.headline
The diagonals cut it into two congruent triangles.

# data[].attributes.subject
The diagonals cut it into two congruent triangles.