A regular decagon is a polygon with ten sides of equal length. Use complete sentences to design a strategy to determine the sum of the interior angles of a regular decagon. In your final answer, include the sum and all of your calculations.

Answer the correctly and i promise i will crown brainliest

1. 1,440°

2. 144°

The sum of the interior angle measures of a regular decagon is 1,440 degrees.

The measure of each interior angle of a regular decagon is 144 degrees.

So first you would subtract 2 from 10 then you would multiply the answer by 180 and get the sum. The sum is 1440 you got that by subtracting 2 from 10 and got the anser of 8. Then you multiplied 8 by 180 and got the answer.

Step-by-step explanation: btw the answer i put down i got it right just to let you know

third option: 6x+8

step-by-step explanation:

we can see that the given question is a sum of series and the values of n vary from 0 to 3

the first term will be:

when n=0, [(0)*x+2] => (0+2) => 2

when n=1, [(1)*x+2] => (x+2) => x+2

when n=2, [(2)*x+2] => 2x+2

when n=4, [(3)*x+2] => 3x+2

so adding up all the terms will give us:

=2+x+2+2x+2+3x+2

=x+2x+3x+2+2+2+2

=6x+8

so,

third option is the correct answer ..

step-by-step explanation:

what grade level is this? need to know so i can look in my old textbooks!