Page 1 - LN2
P. 1

SAI International School
                                                      CLASS – VII


           Mathematics
           Chapter-10: Practical Geometry-2
           Lesson Notes – 2


           SUBTOPIC: Constructing a Triangle using SSS and SAS criterion


               1.  SUBTOPIC: Construction of triangles when three sides of a triangle are given
                  (SSS)


                  In  this  Chapter,  we  looked  into  the  methods  of  some  ruler  and  compasses
                  constructions.

                  (i) SSS: Given the three side lengths of a triangle.
























                  EXAMPLE-


                  1.  Construct a triangle ABC, given that AB = 5 cm, BC = 6 cm and AC = 7 cm.


                  Construct ΔXYZ in which XY = 4.5 cm, YZ = 5 cm and ZX = 6 cm.


           SOLUTION:

           Step 1 First, we draw a rough sketch with given measure, (This will help us in deciding how to
           proceed).
   1   2   3   4   5