Answer:
(-4,-7)
(4,7)
(-4,-5)
(1,-1)
Step-by-step explanation:
Answer: 80
Step-by-step explanation:
We can use the formula
, where
are the lengths of the diagonals.
By the distance formula,

So, the area is 
Answer:
-2v = (-2x3, -2x4) = (-6,-8)
Answer:
217
Step-by-step explanation:
124/4 = 31
31*7 = 217