What we must to find ?

I do not understand why, but my program gives

different result, than sample.

in this picture, i draw a figure with yellow,

i think area of this figure is an answer, i am right ?

download this picture:

http://slil.ru/28091271Re: What we must to find ?

Posted by

svr 17 Oct 2009 23:21

Question is simple.

H is not diven then we have plane problem.

Two adjacent, rejion after antey+ antey itself.

No subject

i do not understand you

Re: What we must to find ?

Posted by

melkiy 18 Oct 2009 01:44

You filled with yellow only the area behind the new building. But the big inner circle must be included in "non-seen" region as well.

Re: What we must to find ?

I think, that this problem can be solved only via integrals.

Analytic geometry doesn't work. I am right?

Re: What we must to find ?

Posted by

svr 18 Oct 2009 16:25

No!i tried to use integral during contest: WA8- rounding error.

At the next day I found simple analytic solution.

Re: What we must to find ?

Are you sure, that it is simple solution? =)

A think, that main problem is that we can't make any Circle Sector, except sector from the center of town, so we can't find exact area behind New Antey Building. Areas of figures with rounded border are hardly calculated.

Re: What we must to find ?

Posted by

svr 18 Oct 2009 17:14

The figure can be decomposed into triangles and

circle segments. All lengths and , therefore areas

are easy calculated, typical school problem.

*Edited by author 18.10.2009 17:15*

Re: What we must to find ?

Solution on Java exists!

No problems with accuracy of calculating.

Re: What we must to find ?

the link for the diagram has expired

can anyone draw a figure and upload again, the area to find out is unclear to refer to from the question.

Re: What we must to find ?

Posted by

ASK 11 Apr 2018 19:21

The new tower blocks its own area plus all the town behind it. This sum needs to be divided by (pi * R**2) and multiplied by 100.