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  Area of trapezoid  =   h/2 (a + b)   where h = height
                                                            a&b are the length
                                                              of the two bases
 thus    A     =      h/2(a +b)
         150     =     h/2(14 + 16)  =  h/2 .30
         150  =15 h
            h  = 150/15 =   10 m