Page 4 - IX Lesson Note- 3 Ttriangles having equal- ch 9 Area of Parallelograms and Triangles
P. 4

Let ABCD be the cross-section of the canal with AB = 10 m, CD = 8 m.
               Let h be the height of the trapezium ABCD. Then,
               Area of trapezium ABCD


                                                      (1 mark)
                                                                               2
               It is given that the area of cross-section of the canal is 72 m .
               Therefore, 9h = 72
                  h = 8 m
               Hence, the depth of the canal is 8 m.


















































                                                            4
   1   2   3   4