Answer:
B. 6 units
Step-by-step explanation:

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You can use a diffrent kind of ruler for math then you could find the answer.
Right Triangles and the Pythagorean Theorem
The Pythagorean Theorem, a2+b2=c2, a 2 + b 2 = c 2 , can be used to find the length of any side of a right triangle.
The side opposite the right angle is called the hypotenuse (side c in the figure).