pakai caranya... karena besok harus di kumpulkan

50 x 40 = 2000 x 2 = 4000
5 x 40 = 200. x 2 = 400
5 x 50. = 250 x 2. =500
4000+400+500= 4900
jawabannya = c. 4.900 cm

jawab
=2{(40×5)+(5×50)+(50×40)}
=2{200+250+2.000}
=2(2.450)
=4.900
jawabnya : C.4.900