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The total number of degrees in any regular polygon is calculated by (S-2) * 180º, where S = the number of sides. So, for a decagon the total is 8 * 180º = 1440º, and the measure of each interior angle is 144º, or 1/10th of the total.
The last bit is correct only if the decagon is regular. It need not be.
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What is the sum of the measures of the angles of a regular decagon?
1440
What is the sum of the measures the interior angles of a decagon?
1440 degrees
What is the measures of one of the interior angles of a regular decagon?
144 degrees.
What is the sum of the measures of a decagon?
Add each side of the decagon, or all ten sides, to get the sum.
What is the sum of the measures of the interior angles of a decogon?
The interior angles of a ten sided decagon add up to 1440 degrees
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