I don't know how to sum geometrical figures. I suppose you could count it: one! One trapezoid! Ah ah ah ah ah.
The sum of the interior angles of any convex four-sided polygon is 360 degrees.
The some of the exterior angles of any convex polygon (no matter how many sides it has) is 360 degrees.
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The sum of the four interior angles of a trapezoid is 360 degrees.
The sum of the 4 interior angles of a trapezoid add up to 360 degrees.
The sum of all the interior angles of any trapezoid is 360 degrees.
Area of a trapezoid: 0.5*(sum of its parallel sides)*height
Yes.