Question

please help me with the question I posted at 4:56pm today

Answer 1

see:
http://www.jiskha.com/display.cgi?id=1267048581

Answer 2

can the following formula to find the sum of the interior angles of a polygon be used on a concave polygon?

180(n-2)

where n= the number of sides
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Draw a regular pentagon
swing two sides in together until they result in concave
note that you increase one interior angle by the same amount as you decrease another at the other end of the line you are swinging in.
The sum remains the same.

Answer 3

Thanks, this makes a lot of sense!!!