I found a rather crytic note waiting for me this morning. It reads:
Would appreciate your mathematical wisdom!
Area Size:-
11.8m x 12.2m x 14.1m x 4.6m
Area Depth:-
200mm
Need to know cubic mass. Ta! John.
Ok, I guess he means volume. But I don’t get it. This can’t be a cuboid since two of the area numbers should be the same, yes?
I’m too hungover to decipher this properly. Any ideas? The guy is a painter/plasterer/builder type, if that gives a clue what he’s on about…
mrcrow
December 19, 2002, 1:03pm
2
sound like some sizes taken for a 200 slab and he wants cubes of concrete to pour
a bit irregular in shape though
about 20 cu.m
Umm…Ok. What are those areas sizes then? Not sure how you arrived at 20m[sup]3[/sup] either. As I said before, I’m a bit hungover after Christmas party, so you have to explain with small words
Maybe it’s meant to say:
11.8m x 12.2m + 14.1m x 4.6m
(maybe the slab is to be L shaped)
??
It’s just a typo. 11.8 x 12.2 plus 14.1 x 4.6, depth 0.2.
Equals 41.8 cubic metres.
Note to self. Always preview.
mrcrow
December 19, 2002, 1:17pm
7
i thought it might have been a garage hardstanding rregular shape
i thought the 4.6 and 11.8 might be at right angles and the other two sort of bisecting each other somewhere
4.6 x 11.8 = 55
and if the other are roughly taken as the sides of a triangle
(14.1 - 4.6) x 11.8 roughly /2 = 58
55 + 58 = 113 x 0.2 = 22.6 and add 10% =25
like is said 20
:smack:
mrcrow
December 19, 2002, 1:20pm
8
*Originally posted by Desmostylus *
**It’s just a typo. 11.8 x 12.2 plus 14.1 x 4.6, depth 0.2.
Equals 41.8 cubic metres. **
i think i would go with this. it seems a bit more sensible.
was typo-ing my reply as this appeared.
I’ll go with this then. Seems I need to know the shape otherwise. Thanks folks.
For the sake of completeness, I’ve since discovered that it was actually this shape:
|\
| \
| \
| \ 14.1m
| \
11.8m | \
| \
| \
| |
| |4.6m
| |
|_______________|
12.2m
…so mrcrow was right with the 20m[sup]3[/sup]
Thanks, dylan_73 . I wondered how that turned out.
mrcrow ’s guess at the shape was right.
Hope you’ve explained to John about the guessing, and how to avoid it in future.