Answer:
10
Step-by-step explanation:
1, 1, 4, 6, 6, 12, 12, 13, 15

The answer is 14
-18/6 is -3. add that to 17 and you get 14.
Answer:

Step-by-step explanation:
A rectangle is inscribed in a circle of radius r.
Radius of the circle is 'r' . the diameter of circle is 2 times radius is 2r
The diameter of the circle becomes the diagonal of the rectangle.
The one part of the rectangle forms a triangle with hypotenuse 2r
Triangle is a special 30:60:90 degree angle
the ratio of the special triangle is 
Hypotenuse is '2r' , so the ratio becomes

So the width of the rectangle is 'r' and length of the rectangle is 
Perimeter = 2 times length + 2 times width
