Question

ajudeem pfv com resolução tbm

Answer 1

VAMOS TRABALHAR COM TRIANGULOS SEMELHANTES

temos dois TRIÂNGULOS

                     V

        10

   A     --------------------  B
  5
C ------------------------------- D
                    18

AB // CD
VA = 10
AC = 5
CD = 18

            TRIÂNGULO                        triângulo
               GRANDE                           PEUQENO

                    V                                         V
                                                        10
  10+5 = 15    
                                                      A--------------B
                                                               X
 C-------------------------D           
             18

VC = 15 m
CD =  18m
VA = 10m
AB = x ?????????(achar)

subsittuir os valores de cada um
          VC                   VA
     -----------   =    ------------
          CD                  AB             

          15m                 10m
         ----------  =   ------------
          18m                 x                   (SÓ cruzar)

15m(x) = 10m(18m)
15m(x) = 180m²
x = 180m²/15m
x = 12m

ENTÃO
SE
ab = x = 12metros
AB = 12 metros