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September 17, 2014

September 17, 2014

Posted by **Shane** on Sunday, March 10, 2013 at 5:46am.

- maths -
**Henry**, Tuesday, March 12, 2013 at 9:51pmWe draw and solve a rt. triangle:

Y = 180 m. = Ht.

X = 850 m = Hor..Distance of ferry.

Z = Hyp. = Line of sight.

tanA = Y/X = 180/850 = 0.21176.

A = 12o = Angle of depression.

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