crazy_viet
BoS Member
our school [mac fields] did it, wondering if anyone did, and how they went. i think i went ok, shooting for 90% or so! how was it for you?
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western region ext1maths trials?? (1 Viewer)
- Thread starter crazy_viet
- Start date
Dumsum
has a large Member;
We may have done Western Region, not sure, probably a mixture of a few sources. Was there a question on the area of the shadow of this fence thing? And the rate at which it changes as the sun goes down?
crazy_viet
BoS Member
yup thats it, i got that =) thevery last question, grr. i drew the graph, but from 0 to 2pi! so ripped it up redid it in the last few secs, but didnt explain what was goin on with the shadow!
~GrOoVy~
*cough* hahahhaa *cough*
yeah i did this trial too...i didn't get that fence question though,can one of you guys or girls kindly explain it to me 
crazy_viet
BoS Member
as i recall, the height was 20, length 30 [metres]
finding area was 300/tanA where A was the angle between top of fence to top of shadow to base of fence.
so tanA = 20/length of shadow
therefore length of shadow is 20/tanA
area of shadow is (base x height)/2
= (30x20/tanA)/2
= 600/2tanA
= 300/tanA
thats the first bit..
finding area was 300/tanA where A was the angle between top of fence to top of shadow to base of fence.
so tanA = 20/length of shadow
therefore length of shadow is 20/tanA
area of shadow is (base x height)/2
= (30x20/tanA)/2
= 600/2tanA
= 300/tanA
thats the first bit..