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9.     Find the perimeter of the given isosceles right triangle.                             2













               10.  Find the area of a triangle two sides of which are 18 cm and 10 cm and the              3
                     perimeter is 42cm.
               11.    The height of a parallelogram is one-third its base. If the area is 108 cm , find     3
                                                                                                 2
                      its base and height.


               12.        Find the area of an equilateral triangle with side ‘x’ unit by                    3

                           using Heron’s formula


               13.    If each side of an equilateral triangle is increased by 2 cm, then its area is        4
                      increases by          . Find the length of each side and the area of the
                      triangle.


               14.   Sides of a triangle are in the ratio of 12: 17: 25 and its perimeter is 540 cm.        4
                     Find its area.
               15.    One side of a right triangle measures 126 m and the difference in lengths of          4

                      its hypotenuse and other side is 42 m. Find the measure of unknown sides
                      and calculate its area.



























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