Q: Diagonal lines in a quadrilateral

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A rectangle.

A quadrilateral is an object formed by four straight lines - two of which meet at an angle. A diagonal is one of the lines which go from one angle to the one other angle in the quadrilateral which it is not already connected to. If the angles of the quadrilateral are A, B, C and D, and A is connected by a straight line to B and D then the diagonal is a line between A and C. A--B | \ | D--C

Any quadrilateral that is not a parallelogram can have only one diagonal that is bisected by the other.

Square

In this case, the quadrilateral is sometimes a parallelogram.

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A rectangle.

A quadrilateral is an object formed by four straight lines - two of which meet at an angle. A diagonal is one of the lines which go from one angle to the one other angle in the quadrilateral which it is not already connected to. If the angles of the quadrilateral are A, B, C and D, and A is connected by a straight line to B and D then the diagonal is a line between A and C. A--B | \ | D--C

a stupid shape

Any quadrilateral that is not a parallelogram can have only one diagonal that is bisected by the other.

isn't it a rhombus ? the ones that are like a slanted square ? because there are no right angles but each diagonal bisects the corners.

Square

A square

Diagonal are the segments (lines) that go from one corner to the opposite one. Area of Quad. = diagonal1 X diagonal2

No. It could be a kite.

In this case, the quadrilateral is sometimes a parallelogram.

Two of them

a quadrilateral in which diagonal are not congruent and larger diagonal is perpendicular bisector of smaller diagonal then it is known as kite