A ferry travels 45 miles every $1\frac{1}{2}$ hours.
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What you have is, a circle inside an OCTAgon, OCTA=8 sides
so hmm get the area of the octagon, will include the area also of the circle,
then
get the area of the circle, and subtract it from the area of the octagon
what's left, is the "difference", or the shaded area
when taking the cotangent, make sure your calculator is in Degree mode, since the angle is in degrees
so hmm get the area of the octagon, will include the area also of the circle,
then
get the area of the circle, and subtract it from the area of the octagon
what's left, is the "difference", or the shaded area
when taking the cotangent, make sure your calculator is in Degree mode, since the angle is in degrees