Answer:
ANY NUMBER THAT HAS A X BEHIND IT..
Examples
1x
7x
15803x
104762836297x
C.) Are the same length
<u>How you know-</u>
No matter how long the rectangle is the diagonals always will measure the same length. Think about two sides of a square, they have to equal the same length because if they were not the same then the shape wouldn't be a square.
It is called a Line. It is a straight path that extends forever