The answer is 11 can someone tell me why?

The sum of interior angles is found by using the following equation:

∑ of interior angles = (S - 2)180

S = sides.

Note that the sum is given to you, or 1620. Plug in 1620 for the sum:

1620 = (S - 2)180

Next, isolate the variable, s. Note the equal sign, what you do to one side, you do to the other. Divide 180 from both sides:

(1620)/180 = ((S - 2)180)/180

S - 2 = 1620/180

S - 2 = 9

Next, isolate the variable, s. Add 2 to both sides:

S - 2 (+2) = 9 (+2)

S = 9 + 2

S = 11

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2

step-by-step explanation:

the answer to this is 4340

hope this if needed hmu