180 cm goodluck and keep your head up!
Answer: The radius of the circle is 19.1 inches.
The length l of an arc corresponding to a central angle x (in radians) is:

Given the values for l and x:

The above is in inches.
Range is about subtracting the lowest number from the highest number!
The lowest number is 54.
The highest number is 65.
65 - 54 = 11
<h2>Answer: 11</h2>
Is the picture that he needs help with not Loadin for anyone else?