tolong dongg no 23, pake cara yaaa...

L = (s x s) + 4 (1/2 x a x t)
   = (16 x 16) + 4(1/2 x 16 x 15)
   = 256 + 4(120)
   = 256 + 480
   = 736 cm

Semoga membantu :)