How many miles from the runway is the airplane at the start of this approach?

Mathematics
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To approach a runway, a plane must begin a 7° descent starting from a height of 3 miles above the ground. To the nearest mile, how many miles from the runway is the airplane at the start of this approach?

a.  3 mi

b.  7 mi

c.  24 mi

d.  12 mi

May 5th, 2015

use SOHCAHTOA

S = sine

O = opposite edge

H = hypotenuse

T = Tangent

A = adjacent edge

C = cosine.

The extreme is where the runaway is indicated by *.


the hypotenuse is the required distance. Therefore,

sine 7= 3/H

H = 3/sine 7= 24mi



May 5th, 2015

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May 5th, 2015
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