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Please help me with segment of a circle formula

I have been going at this for 6hrs and now i decided to ask for some help. It is really killing me.

I am trying to figure out the formula to get the area of a segment.

Here is a pic of my example.

Attachment 19477

Ok now here is what I have but something is wrong. I know its messy but I really don't know the proper formula. I know that the answer should be around 175-177 inches well i think at this point im not sure of anything.

segH = 6

r1 = segH / 2

r2 = segH * 8

r3 = 48*48

r4 = r3/r2

r5 = r1+r4

side1 = r5 - segH

side2 = 48/2

miss1 = side1 * side1 + (side2 * side2)

miss2 = sqrt(miss1)

sin1 = miss2 / 48

segsolve = (r5 * r5) /2

segsolve1 = (.017 * sin1) - sin1

Area = segsolve * segsolve1

Help :(