Hi there,

i have attached a PDF showing a shape, of which i have to calculate area.

i dont know where to start from.it would be much appreciated if anyone can help me out.

thanks

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- Jul 22nd 2009, 10:24 PMmasiboymaths for surveying purposes
Hi there,

i have attached a PDF showing a shape, of which i have to calculate area.

i dont know where to start from.it would be much appreciated if anyone can help me out.

thanks - Jul 22nd 2009, 10:33 PMCaptainBlack
ABEF is a rectangle of known dimensions, so you can calculate its area

CDEG is a rectangle of sideds: $\displaystyle 18.3$ and $\displaystyle 19.9-9.8$ metres

GBC is a sector of a circle so its area is $\displaystyle \pi r^2 (\theta/360) $, where $\displaystyle r=19.9-9.8$, and $\displaystyle \theta$ is $\displaystyle 82^{\circ}13'46''$ expressed in decimal degrees.

CB - Jul 22nd 2009, 11:15 PMmasiboy
thanks Captain Black,now it loks quite straight forward to me, so this means height of 32.4 doesnt play any part in calculating the area???

- Jul 23rd 2009, 02:01 PMaidan

Given:

BE and CD are parallel

&

FD and GC are parallel

That implies that point G__CANNOT__be on the line BE.

If G were on the line BE then angle BGC (which is given as 82deg13min46sec) should equal angle GCD (which is indicated as 90degrees).

It really looks as if this is a "flawed" question.

That is, you are given invalid information for the purpose of understanding how you handle errors.

What data will you use and what information will you ignore? - Jul 23rd 2009, 02:22 PMCaptainBlack