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It is not easy to show, but they certainly exist. For example, consider the quadrilateral with vertices at (0,0), (1,0), (0,1) and any point in the first quadrant other than (1,1)

Q: Could you show a quadrilateral with one right angle?

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To show a right angle you have to mark the inside corner so that it looks like a square.

If you wan't to show that a pentagon has no right angles, then don't put any right angle signs in the figure.

a square, rectangle, rhombus.....

That's exactly what the box means! That box is there to show that an angle is right, as right angles can have different properties than acute or obtuse angles.

To prove that a quadrilateral is a right trapezoid, you need to show that it has one pair of parallel sides and one pair of right angles. This can be done by using the properties of parallel lines and perpendicular lines.

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I don't think this is possible. there is not a quadrilateral with these qualities. If it is a quadrilateral, it will automatically have parallel lines, but there is not one that has both. The closest one would be the trapezoid, with a set of parallel lines, but no right angle. The square and rectangle have two sets of parallel lines and 4 right angles.

To show it is a right angle, and that it is perfectly square.

To show a right angle you have to mark the inside corner so that it looks like a square.

If you wan't to show that a pentagon has no right angles, then don't put any right angle signs in the figure.

a square, rectangle, rhombus.....

I don't know what the name of it is but I can draw it.......It's something like that|---------------\| \| \| \| \| \|--------------------\CORRECTIONApart from the fact that this browser does not allow multiple spaces, the above diagram, if correctly viewable, would have TWO right angles - at the top left and bottom left.The solution is simply to tilt the top line so that it is not horizontal, though not so much that the angle at top right becomes a right angle.

90

Two lines that form a right angle are Perpendicular. This can be show by an upside down T.

This is not possible. If a triangle is a Right angled triangle then the sum of the two angles which are not right will be = 90 [Angle Sum Property] That's why you see.

270 degree

Think of your regular trapezoid (half a hexagon). Now cut it in half with a line perpendicular to the top and bottom. You can see the right angles along one side. The top and bottom lines are parallel. The seond angle on the bottom is acute, and the second top is obtuse. Can't be bothered to provide diagrams, though. Draw them yourself.

That's exactly what the box means! That box is there to show that an angle is right, as right angles can have different properties than acute or obtuse angles.