Answer: lenght x widthx height
Step-by-step explanation:
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There is 1 decameter in 0.01 kilometers.
When there is 4.5 kilometers, there is 450 decameters.
Hope this helps! ☺♥
Imagine this as a circle. The circle will have a radius of 17mi and the lighthouse will be in the middle. The area of the circle will be the area over which the beacon can be seen.

is the equation for the area of the circle where A is the area.
Now we simply plug in our information
A=

A=907.9