A plane is 3.5 miles above the ground. The pilot sights the airport at an angle of depression of 20 ∘. To the nearest tenth of a mile, what is the ground distance between the plane and the airport? Enter the ground distance to the nearest tenth of a mile.

9.6 miles

Step-by-step explanation:

Looking at the diagram we have everything we need except for the adjacent.

We know the formula of the  tan∅ =

where ∅ = 20 and opposite is 3.5.

Solving for adjacent yields 9.6 miles.

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x

the answer is d

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