please help.

Question

the question is, How many degrees in a triangle which is 180 degrees, quadrilateral 360 degrees ??
is that right.
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and i need help on the
11- gon ?
20- gon?
and it says what is the formula??

Answer 1

triangles - 180 degrees, yes
quadrilaterals - 360 degrees, yes

11-sided figure: http://www.mathonline.org/mho/view.cgi?27149

20-sided figure:
http://www.mathonline.org/mho/view.cgi?31282

Answer 2

The sum of the interior angles of a polygon is given by 180º(n-2) where n is the number of sides