The 4 interior angles of any quadrilateral always add up to 360 degrees
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In a quadrilateral the sum of all four angles equals 360º.
No, a quadrilateral couldn't have four obtuse angles because the four interior angles of a four-sided quadrilateral add up to 360 degrees, and the sum of the measures of four obtuse angles would be greater than 360 degrees.
The four interior angles of any quadrilateral add up to 360 degrees
Not sure what a quadrilarel is. A quadrilateral has no intrinsic sum. It has four interior angles (that sum to 360 degrees), it has four sides whose lengths can have any sum (the quadrilateral's perimeter) you want. Its area can be any number you want.
There are four angles in a trapezoid since a trapezoid is a quadrilateral. A quadrilateral has four sides and four angles.