There is a slide in a park. One of its side walls has been painted in some color with a message “KEEP THE PARK GREEN AND CLEAN” (see Fig. 12.10). If the sides of the wall are 15 m, 11 m and 6 m, find the area painted in color.


The sides of the triangle are 15 m, 11 m and 6 m.

Parameter of the triangular walls = 3(side)


= 15 + 11 + 6


= 32 m


Semi perimeter of triangular walls(s) =


= 16 m


Using Heron’s formula,


Area of the advertisement =


=


=


=


= 20 m2


3
1