Perimeter Pentagon

Geometry Level 1

The number of diagonals in a regular pentagon is n n . Given that the side length of a regular pentagon is also n n , find the perimeter of the pentagon.


The answer is 25.

Alex Segesta by Alex Segesta , 20, USA

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4 solutions

Vaibhav Agarwal
Mar 3, 2014

No . of diagonals = 5C2 - 5 = 5...Thus, n=5, so 5n=25

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Nikko Quirap
Apr 12, 2014

let n be the number of sides

let d be the number of diagonals

d = (n(n-3))/3

d=(5(5-3))/3

d=5

Perimeter = 5(5) = 25

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Venkata Sirish
Mar 22, 2014

number of diagonals = 5 ,,,,,,,, soo perimeter = 5*5 = 25

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Archiet Dev
Mar 4, 2014

you made a mistake while presenting the question ...in the question there is nothing that describes that it's a pentagon(to solve the question you need to put the mind)but the headline described the question...making it a cake walk...

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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