nfer 11C

[rr]

CAN ANYONE EXPLAIN 30 QUESTION OF 11C IN NFER RELATING TO ANGLES, I AM GETTING CONFUSED

[fm]

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.

[rr]

yes thanks

[Guest55]

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