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Grample \( 5.5 \) The floor of a hall is covered with identical tiles which are in the shapes of wiangles. One such triangle has the vertices at \( (-3,2),(-1,-1) \) and \( (1,2) \). If the floor of the hall is completely covered by 110 tiles, find the area of the floor.

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vertices of one triangular tile are at (-3.2),(-1,-1)and(1,2)

Area of this tile=1÷2{(3-2+2)-(-2-1-6) sq.units 
                           =1÷2(12)
                            =6 sq.units

since the floor is covered by 110 triangle shaped identical tiles,
  
area of the floor =110×6=660 sq.units

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