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 Post subject: nfer 11CPosted: Tue Jun 23, 2009 10:37 pm

Joined: Sun Jun 21, 2009 2:27 am
Posts: 21
CAN ANYONE EXPLAIN 30 QUESTION OF 11C IN NFER RELATING TO ANGLES, I AM GETTING CONFUSED

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 Post subject: Posted: Wed Jun 24, 2009 8:02 am
In regular shapes, which these all are, all sides and all angles are equal.

The more sides, the bigger the angle. That would the quickest explanation for a young child.

More thoroughly:

Equilateral triangle: 60 degrees each (180 divided by 3) A
Square : 90 degrees each (360 divided by 4) D
Pentagon : 108 degrees each (540 divided by 5) C
Hexagon : 120 degrees each (720 divided by 6) B
Heptagon : 128.5 deg. each (900 divided by 7)
Octagon : 135 degrees each (1080 divided by 8) E

As you can see, with each new side, the sum of the angles goes up by 180 degrees.

Thus you have A D C B E, so C is in the middle.

Hope this is the right question. This is the multiple choice version of that paper.

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 Post subject: Posted: Mon Jun 29, 2009 9:38 pm

Joined: Sun Jun 21, 2009 2:27 am
Posts: 21
yes thanks

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 Post subject: Posted: Mon Jun 29, 2009 10:04 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 13994
It's easier to remember that the external angles of any polygon add to 360.

So a regular pentagon has 5 exterior angles 360 divided by 5 = 72

Interior angle = 180 - 72 =108

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