Download Quadrilaterals - Parallelograms Notes

GSE Geometry
Unit 2 – Quadrilaterals & Congruence
2.1 – Notes
Name: __________________________________________ Date: _____________________________
Quadrilaterals – Parallelograms
UNIT QUESTION: What are the properties and characteristics of polygons?
Today’s Question: What four things do we know about all parallelograms?
A parallelogram is a quadrilateral with both pairs of opposite sides parallel.
If a quadrilateral is a parallelogram,
then its opposite sides are congruent.
If a quadrilateral is a parallelogram,
then its opposite angles are congruent.
If a quadrilateral is a parallelogram,
then its consecutive angles are supplementary.
If a quadrilateral is a parallelogram,
then its diagonals bisect each other.
If a quadrilateral is a parallelogram,
then its opposite sides are parallel.
Practice:
K
1.
15
23
N
K
3.
N
L
M
M
L
105°
N
L
105°
K
2.
K
4.
N
M
32
L
M