Determine the pressure drop per 300m length of new 0.20m diameter horizontal Cast iron water pipe when the average Velocity is 1.7m/s.

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i just did this and got a 100.

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y