Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

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

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

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

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,466

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

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

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

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,466

B is correct.

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

but how do i get VE and FE?

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,466

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

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

ok So I got :

xvef= 3816

bult= 2728

RMCD= 1470

3816 + 2728 + 1470 = 8014 mm2

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

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

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,466

hi

Q18 correct. Well done!

Just give me a moment and I'll post again on the other one.

Bob

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,466

And also 206 is correct. Excellent!

Bob

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

Thank you

Offline