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
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
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