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SAI International School
                                                      CLASS - VIII


               Mathematics


               CHAPTER-4: PRACTICAL GEOMETRY

               SUBTOPIC: SPECIAL TYPE OF QUADRILATERAL




               Construction of special type of quadrilateral
               Lesson Note:


                      Definition: A four sided polygon is known as quadrilateral.
                      A quadrilateral has 10 parts - 4 sides, 4 angles and 2 diagonals. Five
                       measurements can determine a quadrilateral uniquely.
                      Five measurements can determine a quadrilateral uniquely.
                    Construction of special type of quadrilaterals.

                      EXAMPLE – 1

               Draw the following:

               1. The square READ with RE = 5.1 cm.


               Solution : Given: RE = 5.1 cm

               To construct: the square READ.


               Steps of construction:












               (i) Draw a line segment RE = 5.1 cm.


                                                          o
               (ii) At point E, construct an angle of 90 and draw an arc of radius 5.1 cm, mark the
               intersection of line and arc as point A.

               (iii) From point R, draw an arc of radius 5.1 cm and from point A, draw another arc of
               radius 5.1 cm, mark the intersection of the two arcs as point D.
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