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a triangle and a rectangle are drawn on a page so that they overlap as shown. inside these figures are placed the digits from 0 to 9. if there are six digits in the triangle and eight digits in the rectangle, how many digits are in the part that belongs to both figures

Mathematics
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i dnt ge the working out
get*
six digits in the triangle-->Let T =6 eight digits in the rectangle---->Let R=8 Total = 10 digits. = T union R (in other words, T OR R) get this much ?

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Other answers:

how do u get 10 digits?
0 to 9 means total 10 digits i assumed that the digits are not repeated, which is a fair assumption here...
ohk...no they not repeated
digits are in the part that belongs to "both" figures = T AND R (T intersection R) = ...... there is a formula for this, you know ? in terms of T,R and T UNION R
but..how do u do year 7 working out..im suposed to draw the diagram and stuff..
'year 7 working out.' ?? i didn't get you..
|dw:1352896076101:dw|
im in year 7
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that's what the question look like
|dw:1352896267033:dw| i am not sure i can give you exact working required by your course/teacher, but i can make u understand how to get the answer....
ok..
now look at that figure, if u want total area of composite figure, will it be appropiate to add the area of triangle and rectangle ?
um...no?
why ?
i don't know
by the area of composite figure do u mean the overlapped shape?
yes,. because then you will consider the "intersection part" twice. once in rectangle and once in triangle, got this ?
um..kinda
so to get area of composite figure, u need to subtract are of intersection, right ?
..uh..yea..
so , we get TOTAL = RECT +TRIANGLE - INTERSECTION. in this case, total = 10 , Rect = 8, triangle =6 u just need intersection
uhuh
not clear ?
clear
so, 10 = 8+6-x where x is digits that belongs to both figures
x= ?
hmm equations..lets see
4?
yes, so there are 4 numbers that belong to both..
ohk..
will u be able to solve similar problems ?
i think so yes
thnx for ur help hartnn
now i need to get back to my other hw
welcome ^_^ and good luck....
thnx for help!!!

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