數王

Rank: 4

2^#

發表於 2009-1-12 13:05 | 只看該作者

Lower right picture is a rectangle.
13 x 5
The rectangle is made by the 4 pieces from the square.
The area is now =65.

[ 本帖最後由 librazhy 於 2009-1-12 14:10 編輯 ]

Rank: 4

3^#

發表於 2009-1-12 13:06 | 只看該作者

Question: Where is the extra 1 coming from?

ricrick

金牌老友 (超級)

Rank: 6 Rank: 6

攝影勳章

4^#

發表於 2009-1-12 13:50 | 只看該作者

there is no extra one. the shapes actually doesn't really fit to a rectangle. the triangle and the rectangular prism thing both have different slopes on their gradients which are supposed to line up and make a straight line in the 13x5 configuration... so it is kind of an illusion... the extra square is squeezed between the lines!

starbug

幾好老友 (中級)

Rank: 3 Rank: 3

5^#

發表於 2009-1-12 14:22 | 只看該作者

阿版主我要投訴 librazhy 整D咁嘅嘢謀殺咗我半個腦嘅腦細胞.

puZZle

Rank: 4

6^#

發表於 2009-1-12 15:08 | 只看該作者

係幅圖係度呃人

BiscottiGelato

幾好老友 (中級)

Rank: 3 Rank: 3

7^#

發表於 2009-1-12 16:42 | 只看該作者

Reason, (5-3)/5 =/= 3/8 (The slopes are not the same, so can't form a triagle that is supposed to constitute half the rectange. Done.

Rank: 4

8^#

發表於 2009-1-12 16:42 | 只看該作者

ima put them on grid.

pls stay focus

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Rank: 4

9^#

發表於 2009-1-12 16:53 | 只看該作者

i think BiscottiGelato has the best answer to explain it, grats & ty.

[ 本帖最後由 librazhy 於 2009-1-12 17:56 編輯 ]

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mcjohnjohn

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Rank: 6 Rank: 6

10^#

發表於 2009-1-12 18:29 | 只看該作者

原帖由 BiscottiGelato 於 2009-1-13 08:42 發表
Reason, (5-3)/5 =/= 3/8 (The slopes are not the same, so can't form a triagle that is supposed to constitute half the rectange. Done.

正確! 舉腳贊成!
你係唔係可以去問樓主攞獎品?