Pattern 13/04

As.1997

Please have a look at the attachment.
The answer is D.
Can someone please explain how they get D. I was able to eliminate A,C, B,

(edited 4 years ago)

2012,s1,q14.png92.6KB

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Reply 1

mqb2766

The cross, circle and stripe all share a vertex and the stripe "points" to the cross.

Reply 2

ChloeHemmings290

Original post by As.1997

Please have a look at the attachment.
The answer is D.
Can someone please explain how they get D. I was able to eliminate A,C, B,

(Original post by As.1997)
Please have a look at the attachment.
The answer is D.
Can someone please explain how they get D. I was able to eliminate A,C, B,
(Original post by As.1997)
Please have a look at the attachment.
The answer is D.
Can someone please explain how they get D. I was able to eliminate A,C, B,
I’m not somebody that does very well in maths, however I noticed that on this net, when it’s made, the two circles will never connect correctly with the cross and the line. The triangle will always be on the bottom of the cube if the open circle is on the top. For E, for the cube to be in the position it is in, the filled circle must be next to the vertical line, however it is next to the horizontal line. If this is wrong I apologise however that is what I managed to work out. I hope this helped :smile:

Reply 3

As.1997

Original post by mqb2766

The cross, circle and stripe all share a vertex and the stripe "points" to the cross.

Using this, idea it limits it to two options: C and D

Reply 4

As.1997

Original post by ChloeHemmings290

I’m not somebody that does very well in maths, however I noticed that on this net, when it’s made, the two circles will never connect correctly with the cross and the line. The triangle will always be on the bottom of the cube if the open circle is on the top. For E, for the cube to be in the position it is in, the filled circle must be next to the vertical line, however it is next to the horizontal line. If this is wrong I apologise however that is what I managed to work out. I hope this helped :smile:

Hey, thanks for your observations. I'm still struggling to get to the answer :frown:

Reply 5

mqb2766

Original post by As.1997

Using this, idea it limits it to two options: C and D

C is wrong. Remember there are two stripes. This stripe must be the left hand one on the second row. It "points" to the wrong object.
The stripe for D must be the right hand one on the second row. The two stripes are on opposing faces.

(edited 4 years ago)

Reply 6

As.1997

Original post by mqb2766

Ahh okay, I get you :smile:

When you tackle these do you use a combination of vertices that touch, opposing shapes, and visualization of the different sides in your head?

Reply 7

mqb2766

Original post by As.1997

Ahh okay, I get you :smile:

When you tackle these do you use a combination of vertices that touch, opposing shapes, and visualization of the different sides in your head?

A few different things. All that you mention and if the sides are two apart on the net (seperated by one side), theyre opposite faces so cant appear on the same view of the cube. The orientation (like in this question) of shapes is also important.

Reply 8

As.1997

Fair enough -- Will keep this in mind.
I'm now having trouble to rule out E.
It looks okay atm to me :l

(edited 4 years ago)

Reply 9

mqb2766

Original post by As.1997

Fair enough -- Will keep this in mind.
I'm now having trouble to rule out E.
It seems to be correct.

The triangle is on the top, given the other two faces.

Reply 10

As.1997

Original post by mqb2766

The triangle is on the top, given the other two faces.

I thought having the black circle at the front face and the blank circle on the top would mean the triangle is on the bottom.

Reply 11

mqb2766

If you assume two are correct, you can argue the third isn't. It doesnt really matter which 2 you pick, but I did the ones that correspond to the 3 bottom right faces on the net. Saves a bit of mental gymnastics with folding the full net.

Reply 12

As.1997

Original post by mqb2766

If you fold the net outwards concentrating on the bottom 3, it would show that C should have a triangle at the top.
But, what if you fold the shape inward, such that the blank circle is on the top, isn't this also possible?

Reply 13

mqb2766

Original post by As.1997

Sure. I suppose checking for
* opposing faces
* 3 faces sharing a vertex
* relative face orientation
Is the way to go. We had just assumed different sets of 2 correct faces and checking the third. This net is deliberately a touch trickier because of the stripes on two of the faces.
Tbh, take a pair of scissors and fold the net up.

(edited 4 years ago)

Reply 14

As.1997

Original post by mqb2766

I think I'm going to have to get the scissors.

Reply 15

mqb2766

Original post by As.1997

I think I'm going to have to get the scissors.

Tbh, they often give you a bit of a hint. B and E are wrong for similar reasons if you concentrate on the bottom right 3 cells in the net.

Reply 16

As.1997

Okay, now I know why it is E. So for these type, you cannot fold inwards. Please have a look at the attachment to see what I mean by inwards, so you can reject my finding if you believe I am wrong.
Based on this rule, it would tell us that E is wrong and D is right.