Depth

Geometry Level 1

Find out d d to 2 decimal places.


The answer is 18.88.

A Former Brilliant Member by A Former Brilliant Member

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2 solutions

Hari Govind
Apr 29, 2014

d/30 = sin 39 degrees hence d = sin 39 *30

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We know

  • The angle the cable makes with the seabed is 39°

  • The cable's length is 30 m.

And we want to know "d" (the distance down).

Start with: sin 39° = opposite/hypotenuse = d/30

Swap Sides: d/30 = sin 39°

Use a calculator to find sin 39°: d/30 = 0.6293…

Multiply both sides by 30: d = 0.6293… x 30 = 18.88 to 2 decimal places.

The depth "d" is 18.88 m

1 Helpful 0 Interesting 0 Brilliant 0 Confused

In the question you asked for 4 decimal places. I've updated it to 2 decimal places.

Calvin Lin Staff - 7 years, 1 month ago

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