Solution:
we are given that
If G is the midpoint of FH, it mean that

we are also given that

So we can write

So 
Answer:
Step-by-step explanation:
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Isolate the w. Note the equal sign. What you do to one side, you do to the other.
Add 3π to both sides
- 3π (+3π) + w = 2π (+3π)
w = 2π + (3π)
w = 5π
w = 5π is your answer
hope this helps