What is the interior angle sum of a 15-gon?

Explanation:

Use the formula below with n = 15

S = 180*(n-2)

S = 180*(15-2) ... replace n with 15

S = 180*13

S = 2340

This formula is based on the idea that a triangle's interior angles add up to 180, and the idea you can partition any polygon into triangles (aka "polygon triangulation")

  720°

Step-by-step explanation:

Use the formula for the Sum of interior angles: I = 180(n - 2) , where n is the number of sides/angles.

I = 180(15 - 2)

 = 180(13)

 = 720

a framing bias

step-by-step explanation:

rodrigo is subject to a framing bias i believe.

-362

step-by-step explanation:

(12)(4)+2(12)-34(12)+2(12)-3

  \/         \/         \/         \/

  48 +   24 -   408 + 24 - 3

      \   /               \   /

          72     -     432 - 3 = -363