Answer: Subtract 18 on both sides is wrong. Its supposed to be add 18 on both sides.
Step-by-step explanation:
Answer:
This is a paralleogram because it machtes the defintion ofa four-sided plane rectilinear figure with opposite sides parallel.
Step-by-step explanation:
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Yes it is. Input the numbers into the pythagorean theorem,

and if they equal each other it is a right triangle.