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First you need to find the Circumference
C = 2 pi r = 2 * 3.14 * 5.5 = 34.54
Arc measure / 360 = 7.7 / 34.54
Arc measure = 7.7 * 360 / 34.54
Arc measure = 80.25
Answer:
80.25 if you are using pi = 3.14
80.2 if you are using pi = 3.141592....
.0026 in scientific notation is 2.6 x 10^-3 so just add 2.6 x 10^-3 + 3.9 x 10 ^-3