Answer:


Step-by-step explanation:
Given
A circular ring
Required
The length
Let
the radius of the ring
The length is calculated by calculating the circumference of the ring.
This is calculated using:

or

Where
diameter
and 
Answer: 85 degrees
Step-by-step explanation:
Answer: intercept is 2/5 slope is (0,9)
The missing angle is 13.6, since we got the sides we can find the hypotenuse of 8 and 11 and that is 13.6 ||
Making the answer: 13.6
Here is my math c=a2+b2=8.2+11.2≈13.60147