
#1
Oct508, 01:15 PM

P: 4

The four sided, a=110.50 ft, b=165.27, c=162.18, and d=a slightly curved line of 146. ft
(from point to point, it still seems to be 146 feet,) anywayThis from a land surveyI believe the distances of width, center point and (height) can "prove" by the angles. The people I have been talking to claim it is a parallelogram. (professionals) and told me the corners have to add to 360 degreesI will post an image. I am confused by the math of the people I have been speaking with. 



#2
Oct508, 01:24 PM

Sci Advisor
HW Helper
P: 8,961

You can always draw a line to turn a four sided figure into 2 triangles.
Since triangle's (on a flat plane) internal angles add to 180 and you have two of them  it must add to 360deg. 



#3
Oct508, 01:42 PM

P: 4

I only know one angle. The angle of the 110.50 ft and the 165.27 feet, is stated to be
121 degrees 11I tried to measure the lines on the survey to get the other angles they appear to be, between the 165.27 ft and 162.18 ft  59 1/2 then between the 162.18 and the 146 ft., the angle of 102 1/2 then between the 146 ft and the 110.50 seems to be 76 1/2.or if measured on the arcnot point to point, 78 1/2I am still trying to locate this diagram file. 



#4
Oct508, 02:00 PM

P: 4

Do trapezium angles have to equal 360 degrees?
attached a mini map shapeI am new here, hope it attaches to this postI would like to be able to calc the angles from the distances shown, however, I seem to be
blocked on this. 



#5
Oct508, 02:07 PM

Sci Advisor
HW Helper
P: 8,961

What are actually trying to work out?
ps if the two horizontal lines are parallel you are ok, otherwise you don't have enough information to calculate the area or angles. Picture it as four rods hinged at the ends, you can push them ito different shapes without changing the lenghts. 



#6
Oct508, 05:33 PM

P: 4

Calculate the angles and from a centerpoint in the parallel line area of the diagram, draw a parallel line grid, (measured approx. 143 3/4 feet across) and then find the centerpoint distance from top to bottom. Then prove the distances from all sides and angleslike a line star.My surveyor had asked me this question about the angles have to add up to 360 degrees, and I said yesbut I think I was wrong, including the curve, the angle total would have to be a couple of degrees more




#7
Oct608, 04:46 AM

P: 255

The four angles of any quadrilateral, i.e., 4sided figures with straight line segments as sides, will add up to 360.
However, your shape is concaveout along one side  Hillsomethingorother so the angles will add up to something slightly larger than 360. I'm afraid that the only way to determine the actual angles along that side, is by straightforward surveying techniques. Do you have a sextant handy? 


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