Answer:
C) 12.2 cm
Step-by-step explanation:
To find the area of a square, you multiply length and width, which for a square, are the same. So to find the length of one of its sides, you have to take the square root of the area.
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Use the distance formula: 
(6, -2), (-2, -12)
⇒ 
⇒ 
= 12.8
The distance between points T and U is 12.8 units.
(6, -2), (-2, -12)
The distance between points T and U is 12.8 units.