What is the sum of the angle measures in a decagon?

1,800°

1,440°

1,260°

210°

Use the formula (n - 2) * 180 to find the sum of the interior measures of a polygon.

n stands for the number of sides that the polygon has, so substitute 10 for n since a decagon has 10 sides.

(10 - 2) * 180, start by solving inside the parentheses and subtracting 10 and 2.

(8) * 180, multiply.

B. 1,440 is your answer.

The answer is B 1,440