Math Is Fun Forum
You are not logged in.
- Topics: Active | Unanswered
#1 2012-11-22 14:09:19
- zee-f
- Member
- Registered: 2011-05-12
- Posts: 1,220
area
I was wondering if my answer is correct
What is the area of this rectangle(in the img)?
A 17.06 sq units
B 60 sq units
C 21.6 sq units
D 53 sq units
E 28.9 sq units
F 51 sq units
One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3
Offline
#2 2012-11-22 14:13:02
- zee-f
- Member
- Registered: 2011-05-12
- Posts: 1,220
Re: area
And I really need help with this :
18. What is the area of this polygon?
ls_XF = 53 mm ls_XV= 72 mm ls_VR= 16 mm
ls_FB = 31 mm ls_BT = 31 mm ls_EU = 47 mm
ls_UL = 31 mm ls_TL = 88 mm ls_DE= 16 mm
ls_RM= 70 mm ls_MC= 21 mm ls_DC= 70 mm
A- 8014 mm2
B- 7030 mm2
C- 6027 mm2
D- 5478 mm2
E- 1782 mm2
F- 1225 mm2
One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3
Offline
#3 2012-11-22 20:24:59
- Bob
- Administrator
- Registered: 2010-06-20
- Posts: 10,621
Re: area
hi zee-f
For the first, I cannot see what answer you chose.
Did you work out the width first ?
For Q18, start by making a drawing on paper. It doesn't have to be accurate, just make it look roughly like the given drawing.
Then mark on all the distances.
Split the shape into rectangles. There's more than one way of doing this step. I've shown one way on my diagram.
Using the length and width* for each rectangle, write down its area.
Add them up and you're done.
* You might have to do some adding or subtracting to work out the distances you need.
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob 
Offline
#4 2012-11-22 23:16:07
- zee-f
- Member
- Registered: 2011-05-12
- Posts: 1,220
Re: area
I choose B for the first one and am working on #18
One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3
Offline
#5 2012-11-23 01:19:06
- Bob
- Administrator
- Registered: 2010-06-20
- Posts: 10,621
Re: area
B is correct.
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob
Offline
#6 2012-11-23 08:27:59
- zee-f
- Member
- Registered: 2011-05-12
- Posts: 1,220
Re: area
but how do i get VE and FE?
One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3
Offline
#7 2012-11-23 08:43:10
- Bob
- Administrator
- Registered: 2010-06-20
- Posts: 10,621
Re: area
Well it looks to me like RMCD is a rectangle, so RD = MC.
Then VE = VR + RD + DE
Or XVEF is a rectangle so VE = XF.
Try both ways and check they give the same answer.
And FE = XV
Or BE = TL - EU then FE = FB + BE
Hope that covers everything you need.
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob
Offline
#8 2012-11-24 07:36:31
- zee-f
- Member
- Registered: 2011-05-12
- Posts: 1,220
Re: area
ok So I got :
xvef= 3816
bult= 2728
RMCD= 1470
3816 + 2728 + 1470 = 8014 mm2
One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3
Offline
#9 2012-11-24 08:11:58
- zee-f
- Member
- Registered: 2011-05-12
- Posts: 1,220
Re: area
20. What is the area of this polygon?
I got F
A 178 sq units
B 129 sq units
C 230 sq units
D 240 sq units
E 219 sq units
F 206 sq units
One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3
Offline
#10 2012-11-24 08:15:49
- Bob
- Administrator
- Registered: 2010-06-20
- Posts: 10,621
Re: area
hi
Q18 correct. Well done!
Just give me a moment and I'll post again on the other one.
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob
Offline
#11 2012-11-24 08:18:47
- Bob
- Administrator
- Registered: 2010-06-20
- Posts: 10,621
Re: area
And also 206 is correct. Excellent!
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob
Offline
#12 2012-11-24 08:21:32
- zee-f
- Member
- Registered: 2011-05-12
- Posts: 1,220
Re: area
Thank you 
One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3
Offline