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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.

Q: Do connecting 4 points yield a quadrilateral?

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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

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.

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.

an isosceles trapeziod could be a quadrilateral because it has 4 sides and a quadrilateral has 4 sides

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Yes because it has 4 sides and points. Any shape with 4 sides or points is a quadrilateral.

Take the 4 corners (vertices) of any 4-sided figure (quadrilateral). Draw the quadrilateral and its diagonals.

There are 4 angles in quadrilateral. 2 angles bisected would yield 2 each 45 degrees angles (or less) and the other 2 angles would yield (bisected ) 45 degrees (or more)!

Points: (3, -2) and (0, 4) Slope: -2

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.

If it is a quadrilateral it cannot be "not a quadrilateral"!

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.

Because a quad has 4 wheels and a quadrilateral has 4 sides!

A quadrilateral has 4 sides.

quadrilateral

If you mean a Quad which touches the circumference at all 4 points, then... # All interior angles add to 360' #Opposite angles add to 180' #The Quad is then referred to as a 'Cyclic Quadrilateral'

A quadrilateral has 4 sides