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Q: How do diagonals of quadrilaterals make a triangle?

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No, a triangle will never have parallel sides.

They are both 4 sided quadrilaterals. Being quadrilaterals, they share these features of quadrilaterals: They both have 4 interior and exterior angles that add up to 360 degrees They both have 2 diagonals They both have a perimeter which is the sum of their 4 sides

You're supposed to ask only one question at a time but here we go for 15 or more questions about quadrilaterals:- 1 Quadrilaterals are 4 sided 2 dimensional polygons 2 Quadrilaterals have 4 interior angles that add up to 360 degrees 3 Quadrilaterals have 4 exterior angles adding to 360 degrees 4 Quadrilaterals have 2 diagonals 5 Quadrilaterals have a perimeter which is the sum of their 4 sides 6 Quadrilaterals have areas with formulae depending on their types 7 Quadrilaterals can individually tessellate 8 Quadrilaterals can be split into 2 triangles 9 Quadrilaterals can be squares 10 Quadrilaterals can be rectangles 11 Quadrilaterals can be parallelograms 12 Quadrilaterals can be rhombuses 13 Quadrilaterals can be trapezoids or trapeziums 14 Quadrilaterals are sometimes isosceles trapezoids 15 Quadrilaterals can look like kites 16 Quadrilaterals can undergo transformations on the Cartesian plane 17 Quadrilaterals are congruent or similar when identical in angles and shapes 18 Quadrilaterals can form the cross-section of prisms 19 Quadrilaterals sometimes have lines of symmetry 20 Quadrilaterals have certain properties within a circle 21 Quadrilaterals can be subjected to trigonometry QED by David Gambell

Yes, if you count four congruencies as six pairs.

A diagonal is normally defined as a straight line joining a vertex of a polygon with any vertex other than an adjoining vertex (lines joining a vertex to an adjoining vertex would simply be a side of the polygon). Since a triangle has only got adjoining vertices, it has no diagonals. Since there are no diagonals, they cannot bisect one another.

Related questions

No. An isosceles trapezium (isosceles triangle with its apex removed) would have congruent diagonals but it is not a parallelogram.

Quadrilaterals only have two diagonals because they only have four vertices.

Quadrilaterals only have two diagonals because they only have four vertices.

All quadrilaterals have 2 diagonals

All quadrilaterals have 2 diagonals.

Rhombuses are the group of quadrilaterals that have diagonals that bisect their opposite angles.

A square, a rhombus and a kite are all 4 sided quadrilaterals that have perpendicular diagonals.

2

square

Rectangles

Not generally.

Quadrilaterals have four sides so the only possible answer to this question is that a quadrilateral only has two diagonals.

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