Parallelogram Formula

Which statement is always true for parallelograms?

• All sides have the same length

• All angles have the same measure

• Opposite sides are equal in length

• Opposite angles have different measures

The figure is a parallelogram.  
Solve for x.  

• 1

• 11

• 7

• 6

The figure is a parallelogram.  
Solve for x.  

• 7

• 2

• 0

• 4

The figure is a parallelogram.  
Solve for x.  

• 7

• 1

• 5

• 2

Prove that if a quadrilateral is a parallelogram, then the opposite sides are congruent.

• parallel

• Alternate Interior Angles Theorem.

• Reflexive Property.

• ASA≅

• Corresponding Parts of Congruent Triangles are Con

Prove that if a quadrilateral is a parallelogram, then the opposite sides are congruent.

• parallel

• Alternate Interior Angles Theorem.

• Reflexive Property.

• ASA≅

• Corresponding Parts of Congruent Triangles are Con

Find the measure of angle b.

• b = 51

• b = 129

If ABCD is a parallelogram, what is the length of BD? 

• 10

• 11

• 7

• 5

The figure is a parallelogram.  
Solve for x.  

• 1

• 10

• 4

• 5

The figure is a parallelogram.  
Solve for x.  

• 1
• 8
• 2
• 6