To solve this problem you must apply the proccedure shown below:
1. Clear the radius from the formula for the circumference of a circle and substitute values, as following:

2. Substitute the radius calculated into the formula for calculate the surface area of the sphere:

The answer is: 
Answer:
b = 2a + c
Step-by-step explanation:
Given
a =
(b - c)
Multiply both sides by 2 to clear the fraction
2a = b - c ( add c to both sides )
2a + c = b
Answer:
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Answer:
4
Step-by-step explanation:
Your answer would be 10.6