Answer:678
Step-by-step explanation:im dumb
Imagine a ladder leaning against the wall and you know the height of the ladder and its distance from the wall and you had to find out the height you could use pythagorean theorem here
Just like any other variable, we complete the same process

Now we can test it, let's say k=4, d=6, and c=2, let's find the value of g

OR
It’s 21.99
Use c=2pi*radius
Diameter divided by 2 = radius