**Important Concepts and Formulas**

1. We need at least five elements of a
quadrilateral to determine it uniquely.

2. A unique quadrilateral can be drawn:

·
if
its four sides and one diagonal are given.

·
if
its three sides and two diagonals are given.

·
if
its three sides and two included angles are given.

·
if
its four sides and one angle are given.

·
if its three sides, one diagonal and one angle
are given.

To learn construction of quadrilaterals ----- Click Here!

To learn construction of quadrilaterals ----- Click Here!

3. A square can be constructed if its
side is known.

4. A parallelogram can be constructed if
its two adjacent sides and one angle are known.

5. A rectangle can be constructed if its
two adjacent sides are known.

6. A rhombus can be constructed if the
lengths of its both diagonals are known.

To learn construction of a square, rectangle, parallelogram and rhombus ----- Click Here!

To learn construction of a square, rectangle, parallelogram and rhombus ----- Click Here!