length of AB = √(2^2+9^2) = √85
slope of AB = 9/2
Now do the other sides, and you must have a pair with the same slope (parallel) and length.
Prove that A(–2, 0), B(0, 9), and C(2, 0) and D(0, –9) are the vertices of a parallelogram.
A. What are the properties of a parallelogram involving slope?
B. What must we KNOW (regarding slopes and sides) to confirm the shape is a parallelogram?
C. Do so to prove these are the vertices of a parallelogram (showing your work).
1 answer
1 answer