It is a question of definition.
In general language the word quadrilateral has different meanings.
In general it is good to discern 3 options:
1. a figure consisting of 4 points is often called (complete) quadrangle,
2. a figure consisting of 4 lines is often called (complete) quadrilateral,
3. a figure consisting of 4 points consecutively and cyclically connected by 4 lines is best called tetragon or quadrigon.
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Take the 4 corners (vertices) of any 4-sided figure (quadrilateral). Draw the quadrilateral and its diagonals.
Points: (3, -2) and (0, 4) Slope: -2
A quadrilateral is a polygon with 4 sides... so if it has 4 sides it is a quadrilateral. your question doesnt make sense because a 4 sided quadrilateral could be any quadrilateral at all.
No, not in plane (Euclidean) geometry. But on the surface of a sphere, a quadrilateral bounded by 2 sets of great circles [one set has its intersecting points at what would be the 'poles', and the other set has its intersecting points on opposite sides of what would be the 'equator'] will have 4 acute interior angles.
an isosceles trapeziod could be a quadrilateral because it has 4 sides and a quadrilateral has 4 sides