Determining If the Figure Is a Parallelogram

If you have a parallelogram, how can you use what you know about angles in a triangle to find the angles in the parallelogram?

• Parallelograms have parallel lines so the angles are 180.

• The angles in a triangle have to equal 180 and there are two triangles in a parallelogram so that must equal 360.

• Triangles and parallelograms are the same.

• Apples and bananas are fruit.

Opposite sides of parallelograms are _______ and _______.

• parallel

  congruent

• congruent

  consecutive

• parallel

  perpendicular

• parallel

  supplementary

______ angles of parallelograms are congruent.

• Consecutive

• Opposite

• parallel

• diagonal

Is the quadrilateral a parallelogram?

• Yes; one pair of opposite sides are parallel

• Yes; one pair of opposite sides are congruent

• Yes; opposite sides are parallel and congruent

• No; only one pair of sides are parallel

• No; only one pair of sides are congruent

Is there enough information to determine that this quadrilateral is a parallelogram?

• yes

• no

Is this a parallelogram

• Yes, both pairs of opposite sides are parallel

• Yes, both pairs of opposite sides are congruent

• Yes, both pairs of opposite angles are congruent

• Yes, one pair of sides is both congruent and parallel

• No

Is there enough information to determine that this quadrilateral is a parallelogram?

• no, because only one pair of opposite sides are

Is this a parallelogram? How do we know?

• yes,opposite sides are congruent

• no we can not prove it is a parallelogram

• yes, one pair of sides are congruent and parallel

• yes, opposite sides are parallel

• yes, diagonals bisect each other

Is this a parallelogram

• Yes, both pairs of opposite sides are parallel

• Yes, both pairs of opposite sides are congruent

• Yes, both pairs of opposite angles are congruent

• Yes, one pair of sides is both congruent and parallel

• No

Is there enough information to determine that this quadrilateral is a parallelogram?

• yes

• no