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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
What else can I help you with?
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
Which quadrilaterals have a diagonal that is also a line of symmetry?
A square
What is the diagonal of a parallelogram?
A parallelogram has two diagonals the same as all 4 sided quadrilaterals
What quadrilaterals have diagonal that bisect each other?
A parallelogram a rectangle a square and a rhombus
Do quadrilaterals have congruent angles?
In general, NO.In general, NO.In general, NO.In general, NO.
Do the diagonals of all quadrilaterals bisect?
No, in general, they do not.
Can quadrilaterals be divided into equal triangles?
In general, no.
Which quadrilaterals have perpendicular bisecting diagonals?
All quadrilaterals have intersecting diagonals.Some symmetric quadrilaterals have perpendicularly bisecting diagonals.Equilateral parallelogramsof which the square is a special case...and the kite where two pairs of adjacent sides are the same length has one diagonal perpendicularly bisected by the other
What is a line drawn between 2 vertices which are not next to each other called?
One AnswerFor quadrilaterals (parallelogram, rectangle, rhombus, trapezoid) its called a diagonal Another:For any polygon or polyhedron, it is a diagonal.
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.
What is the general term for a four sided figure?
quadrilaterals
How do you dissect a square into 4 quadrilaterals except for squares?
2 diagonal lines from corner to corner to create 4 equal triangles
What are 3 types of quadrilaterals?
Quadrilaterals are four sided, two-dimensional shapes. Each side has to be a straight line, even if it looks diagonal in accordance to the other sides. Three examples include squares, rectangles, and parallelograms.
