I'm sorry! I hope this helps. (I don't know how to get my attachment any bigger) but I'll try this.

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What i need to find is arc HF where GH = 6 units and IG = 12 units and angle IGA is conguent to angle ACE; to make my circle a little more clear the middle letter is A; vertical cords are IF and BE. Radii is AH and AD. angle G and C are right angles. In addition to that I'll try one more attachment. thanks for trying to help!