To approach a runway, a plane must begin a 7° descent starting from a height of

Mathematics
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To approach a runway, a plane must begin a 7° descent starting from a height of 2 miles above the ground. To the nearest mile, how many miles from the runway is the airplane at the start of this approach?
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A.28 mi
B. 7 mi
C.16 mi
D.41 mi
Apr 29th, 2015

Given the opposite side a = 2 mi to the angle  α = 7° in a right triangle, find the hypotenuse c.

The relation  a = c sinα  implies that  c = a / sinα = 2/sin7° = 2/0.122 = 16 miles.

Answer: C

Apr 29th, 2015

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