Geometry
posted by Amanda .
How do I determine if a quadrilateral is a parallelogram? Does anyone know the formula to determine this because I have to justify my answers. Thanks.
Respond to this Question
Similar Questions

Geometry
A shopping center plot of land is in the shape of a parallelogram. Give two other facts about the plot or roads through it. I do not understand can you please explain? 
Geometry
Graph quadrilateral ABCD. Then determine the most precise name for each quadrilateral. 1. A (0, 5), B (–5, 0), C (0, –5), D (5, 0) (1 point) square kite rectangle 2. A (–4, 4), B (3, 4), C (5, 0), D (–2, 0) (1 point) square … 
geometry CA
Graph quadrilateral ABCD. Then determine the most precise name for each quadrilateral. 1. A (0, 5), B (–5, 0), C (0, –5), D (5, 0) (1 point) square kite rectangle 2. A (–4, 4), B (3, 4), C (5, 0), D (–2, 0) (1 point) square … 
GeOmEtRy!!!
Determine whether a figure with the given vertices is a parallelogram. use the method indicated. P(5,1) S(2,2) F(1,3) T(2,2); Slope Formula 
geometry
What is the most precise name for quadrilateral ABCD with vertices A(–3, 2), B(–1, 4), C(4, 4), and D(2, 2)? 
calculus 12
7. ABC has vertices A(3,2,5), B(4,1,7) and C(8,3,6). a) Determine the area of ABC. b) Determine the coordinates of point D such that ABCD is a parallelogram. c) Is the parallelogram a rectangle? 
Vectors
The person who helped me before was not very helpful. ABC has vertices A(3,2,5), B(4,1,7) and C(8,3,6). a) Determine the area of ABC. b) Determine the coordinates of point D such that ABCD is a parallelogram. c) … 
Geometry
quadrilateral A B C D on a graph. Point A is at ( 5, 1), Point B is at ( 6, 1), Point C is at (4, 3), Point D is at (7, 5). Prove the quadrilateral is a parallelogram by using Theorem 57; if the diagonals of a quadrilateral bisect … 
Geometry
quadrilateral A B C D on a graph. Point A is at ( 5, 1), Point B is at ( 6, 1), Point C is at (4, 3), Point D is at (7, 5). Prove the quadrilateral is a parallelogram by using Theorem 58; if one pair of opposite sides of a quadrilateral … 
Geometry
Quadrilateral ABCD is a parallelogram. If adjacent angles are congruent, which statement must be true?