Answer:
Step-by-step explanation:
The perimeter of a circle is the circumference of the circle. To find it, use the formula 
.
The diameter here is two times the radius x, d = 2x. But here it has been decreased by 2 so it becomes d = 2x - 2.
Substitute into the formula.
The answer is 27/4 or 6 3/4
I’m pretty sure it’s B. If not then sorry.
The number of unique combinations that can be formed by picking one object from each set is =960. That is option C.
<h3>Calculation of unique combinations of a number set</h3>
Number combination is a mathematical technique that shows the number of possible arrangements in a collection of items.
The first set of objects = 4. There are a total of 4 possibilities.
The second set of objects = 5. There are a total of 5 possibilities
Therefore from first and second set, the total number of possibilities = 4×5 = 20
For the whole set, the total possibilities;
= 4×5×6×8
= 960
Learn more about number combination here:
brainly.com/question/295961
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