Please help, I'm struggling

Question

Latitude gives the measure of a central angle θ with vertex at the earth's center whose initial side goes through the equator and whose terminal side goes through the given location. The latitude of Springfield, Illinois is 40° 12′ north. Assuming the earth is a perfect sphere of radius 4000 miles, what is the distance from the equator to Springfield? (Approximate to nearest whole number.)

Answer 1

1) 40° 12' = 40.2°

2) Circumference = 2(4000)(π)

3) Arc = (40.2/360)(2)(4000)(π)