The radius is 8 because its half the diameter.
Answer:
The width of rectangle is
or 
Step-by-step explanation:
we know that
The perimeter of rectangle is equal to

where
L is the length of rectangle
W is the width of rectangle
we have

substitute

solve for x





simplify

<em>Find the width of rectangle</em>

substitute the value of x

Convert to mixed number

The midpoint is calculated by averaging the coordinates of its endpoints:

Now we can use the usual distance formula to get the length of SM:

1.
Answers A. and B.
2.
Answer C.
3.
Answer A.
4.
Answer B.
5.
Answer D.