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Because the angle sum of all quadrilaterals is 360 degrees.

Q: Why is the angle sum of a trapezoid 360?

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The sum of the angles in a trapezoid is 360 degrees, therefore, the forth angle in this problem is: 360 - (60+120+80) = 100 degrees

The 4 interior angles add up to 360 degrees

the average angle is acuite w/ obtuse * * * * * An incorrect answer.

360 degrees.

the sum of the angles of a trapizoid equal 360 degrees.

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360 degrees

Both are quadrilaterals, so the sum of their angles is 360⁰.

The sum of the angles in a trapezoid is 360 degrees, therefore, the forth angle in this problem is: 360 - (60+120+80) = 100 degrees

The 4 interior angles add up to 360 degrees

The 4 interior angles add up to 360 degrees

The exterior angle sum of ANY plane polygon (ie 2-dimensional figure with straight sides) is 360 degrees.

the average angle is acuite w/ obtuse * * * * * An incorrect answer.

The sum of the four interior angles of a trapezoid is 360 degrees.

Yes.

The sum of the 4 interior angles of a trapezoid add up to 360 degrees.

360 degrees

360 degrees OK