Assorted Brain Teasers by Kundan Pangtey - HTML preview

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TEASER - 08

PLOTS & SUB-PLOTS

A square piece of plot / land (green) with open space and road (brown) on all side is to be divided into many sub-plots (parts). With following conditions,

1)   All sub-plots should be  equal in size

2)   All sub-plots should be  equal in shape

3)   All sub-plots should have equal accessibility to road and open space present on all sides

Under  aforementioned  conditions,  this  piece  of  land  can  be divided into how many maximum sub-plots (parts)

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SQUARE PLOT WITH ROADS ON ALL SIDES

THE EXPLANATION:

Division of a square plot of land:

The land being  an areal quantity,  it  can have only two dimensions (2D), therefore individual sides or individual corners can be divided 2 times  only to make them  symmetrical  on  either  side  of  a  line. The square plot of a land has 4 corners (4C) and 4 sides (4S) and each side  has  fixed  length  and  each  corner  has  fixed  angle,  hence  the sum  total  of  length  of  sides  and  angle  of  corners  when  divided should remain constant (4C + 4S).

Corners (C)      = 4

Sides (S)          = 4

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SQUARE PLOT WITH 4 SIDES & 4 CORN

(1)  When divided into 2 sub-plots:

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SQUARE PLOT DIVIDED INTO 2 EQUAL PARTS

(2) When divided into 4 sub-plots:

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SQUARE PLOT DIVIDED INTO 4 EQUAL PARTS

(3) When divided into 8 sub-plots:

8 Plots   = 8 x (½C +½S)        = (4C + 4S)

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SQUARE PLOT DIVIDED INTO 8 EQUAL PARTS

Keeping in focus the conditions laid down above, it is observed that a square land can be divided into 2, 4 and 8 equitable sub-plots only and cannot be divided into 3, 5, 6, 7, 9 or more number of sub-plots.

The shape of a piece of land can be trigonal, pentagonal, hexagonal, circular and so on.

The  sub-divisions  or  sub-plots  are  in  a  way  symmetrical  divisions and their number is dependant on the shape of a plot.  The corners and  sides  of  a  square  or  a  hexagonal  shaped  land  have  fixed number  of  corners  and  sides  and  are  linked  together  in  a  definite pattern.  To  make  identical  sub-divisions  (sub-plots)  corners  and sides would have to be equally shared without changing their original positions.

The  relationship  between  the  number  of  corners  or  sides  and  the maximum possible sub-divisions or sub-plots equal in all respect can be established in following manner:

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Square plot (4 sided)

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8 EQUAL DIVISIONS

Trigonal  plot (3 sided)

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6 EQUAL DIVISIONS

Pentagonal plot (5 sided)

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10 EQUAL DIVISIONS

Hexagonal plot (6 sided)

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12 EQUAL DIVISIONS

Round plot (infinite sided)

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INFINITE EQUAL DIVISIONS

An infinite number of radial rays can be drawn from the center of a circle (round plot)  outward.  A circle can have any number  of  sides and corners hence it can be divided into an infinite number of equal parts or sub-plots.

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