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An convex n-gon has n(n-3)/2 diagonals.
So a square is a 4-gon and it has 4(1)/2=2 diagonals.
A pentagon has 5(2)/2=5 diagonals.
quadrilaterals always have 2 diagonals.
Here is a link with some pics to help you see the various kinds they have. That is to say, are they perpendicular, to they bisect each other?
http://illuminations.nctm.org/LessonDetail.aspx?id=L655
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What is the diagonal of a parallelogram?
A parallelogram has two diagonals the same as all 4 sided quadrilaterals
What are the shape in geometry?
There are lot of shapes in geometry. It is called polygons. Triangle, trapezoid, circle, parallelogram, rhombus, rectangle, diagonal, square etc. Parallelogram, rhombus, rectangle, diagonal, square, and trapezoid are quadrilaterals.
Do diagonal of a quadrilateral always intersect?
Not always. They would only intersect when the internal angles are each less than 180 degrees - which not all quadrilaterals have.
Do the two diagonal bisect each other?
2 diagonals bisect each other only in the case of square , parallelogram, rhombus , rectangle and isosceles trapezium ;not in ordinary quadrilaterals.
What is the angle sum rule for all quadrilaterals?
The sum of all (interior) angles must equal 360 degrees
