How many diagonals does a regular pentagon have?

Please help me on this problem! I would appreciate steps on how to get the answer or hints!

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- Sep 23rd 2013, 10:47 PMNadeshikoDiagonals in a regular pentagon
How many diagonals does a regular pentagon have?

Please help me on this problem! I would appreciate steps on how to get the answer or hints! - Sep 23rd 2013, 11:39 PMvotanRe: Diagonals in a regular pentagon
A pentagon is a polygon that have five sides. a diagonal in a polygon is the line that joins any two vertices. The best you to get your answer is to sketch a pentagon and draw the diagonals. How many diagonal you will count?

- Sep 24th 2013, 03:45 AMPlatoRe: Diagonals in a regular pentagon
- Sep 24th 2013, 08:28 PMNadeshikoRe: Diagonals in a regular pentagon
- Sep 24th 2013, 10:00 PMvotanRe: Diagonals in a regular pentagon
- Sep 25th 2013, 09:02 PMNadeshikoRe: Diagonals in a regular pentagon
I redrew the figure and I still got 4 diagonal lines. I tried 4 or 5 times and did it separately and compared my answers and I still got the same number of diagonal lines.

- Sep 25th 2013, 11:36 PMvotanRe: Diagonals in a regular pentagon
- Sep 26th 2013, 06:24 PMNadeshikoRe: Diagonals in a regular pentagon