book Maths Puzzle Numerical Ability

Please help me to find a genral rule for calculating the sum of angles for any n- sided polygon...
Help its homework and needed by Sunday the 16th of October
Cheers,

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book Other Question

solve triangle ABC using the given info...

B=82 deg, a=3, c=7
This is from page 100, #26 of Dr. Rapalje's Intermediate Algebra book- One Step at a Time.

(x + y)to the 3rd power = (x + y) (x + y) (x + y)
= (x + y)