shewolfangz
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
Delete
Share
This Question is Closed
shewolfangz
Best Response
You've already chosen the best response.
1
i dnt ge the working out
shewolfangz
Best Response
You've already chosen the best response.
1
get*
hartnn
Best Response
You've already chosen the best response.
1
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 ?
shewolfangz
Best Response
You've already chosen the best response.
1
how do u get 10 digits?
hartnn
Best Response
You've already chosen the best response.
1
0 to 9 means total 10 digits
i assumed that the digits are not repeated, which is a fair assumption here...
shewolfangz
Best Response
You've already chosen the best response.
1
ohk...no they not repeated
hartnn
Best Response
You've already chosen the best response.
1
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
shewolfangz
Best Response
You've already chosen the best response.
1
but..how do u do year 7 working out..im suposed to draw the diagram and stuff..
hartnn
Best Response
You've already chosen the best response.
1
'year 7 working out.' ?? i didn't get you..
hartnn
Best Response
You've already chosen the best response.
1
|dw:1352896076101:dw|
shewolfangz
Best Response
You've already chosen the best response.
1
im in year 7
shewolfangz
Best Response
You've already chosen the best response.
1
|dw:1352896192555:dw|
shewolfangz
Best Response
You've already chosen the best response.
1
that's what the question look like
hartnn
Best Response
You've already chosen the best response.
1
|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....
shewolfangz
Best Response
You've already chosen the best response.
1
ok..
hartnn
Best Response
You've already chosen the best response.
1
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 ?
shewolfangz
Best Response
You've already chosen the best response.
1
um...no?
hartnn
Best Response
You've already chosen the best response.
1
why ?
shewolfangz
Best Response
You've already chosen the best response.
1
i don't know
shewolfangz
Best Response
You've already chosen the best response.
1
by the area of composite figure do u mean the overlapped shape?
hartnn
Best Response
You've already chosen the best response.
1
yes,.
because then you will consider the "intersection part" twice.
once in rectangle and once in triangle,
got this ?
shewolfangz
Best Response
You've already chosen the best response.
1
um..kinda
hartnn
Best Response
You've already chosen the best response.
1
so to get area of composite figure, u need to subtract are of intersection, right ?
shewolfangz
Best Response
You've already chosen the best response.
1
..uh..yea..
hartnn
Best Response
You've already chosen the best response.
1
so , we get
TOTAL = RECT +TRIANGLE - INTERSECTION.
in this case,
total = 10 , Rect = 8, triangle =6
u just need intersection
shewolfangz
Best Response
You've already chosen the best response.
1
uhuh
hartnn
Best Response
You've already chosen the best response.
1
not clear ?
shewolfangz
Best Response
You've already chosen the best response.
1
clear
hartnn
Best Response
You've already chosen the best response.
1
so, 10 = 8+6-x
where x is digits that belongs to both figures
hartnn
Best Response
You've already chosen the best response.
1
x= ?
shewolfangz
Best Response
You've already chosen the best response.
1
hmm equations..lets see
shewolfangz
Best Response
You've already chosen the best response.
1
4?
hartnn
Best Response
You've already chosen the best response.
1
yes, so there are 4 numbers that belong to both..
shewolfangz
Best Response
You've already chosen the best response.
1
ohk..
hartnn
Best Response
You've already chosen the best response.
1
will u be able to solve similar problems ?
shewolfangz
Best Response
You've already chosen the best response.
1
i think so yes
shewolfangz
Best Response
You've already chosen the best response.
1
thnx for ur help hartnn
shewolfangz
Best Response
You've already chosen the best response.
1
now i need to get back to my other hw
hartnn
Best Response
You've already chosen the best response.
1
welcome ^_^
and good luck....
shewolfangz
Best Response
You've already chosen the best response.
1
thnx for help!!!