Answer:
I would like to say A because Diagonals of a rectangle Bisect each other at a right angle.
This seems likely
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Answer:
Perpendicular lines.
Step-by-step explanation:
They are called perpendicular lines.
If the slope of one line is m them the slope of the other is -1/m.
The systems will intersect at (1,-4), and i think the system has infinite solutions (not sure)
Answer:
The diameter is related because it helps find the circumference.