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Jawab :

Tinggi trapesium (tt) : Tarik garis bantu ...
(tt)² = 5² - 3²
      = 25 - 9
(tt)² = 16
tt = 4 cm

Lp = 2 La + Ka.t
     = (2 x 1/2 x 4 x (10 + 4)) + (10+5+4+5)x15
     = 56 + 360
     = 416 cm²



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