Ainayya
A. p = 8 cm = 80 mm l = 25 mm t = 10 mm jadi lp balok = 2 x ((pxl) + (pxt) + (txl)) = 2 x ((80x25) + (80x10) + (10x25)) = 2 x (2000 + 800 + 250) = 2 x 3050 = 6100
b. p = 4 dm = 40 cm l = 20 cm t = 15 cm jadi lp balok = = 2 x ((pxl) + (pxt) + (txl)) = 2 x ((40x20) + (40x15) + (15x20)) = 2 x (800 + 600 + 300) = 2 x 1700 = 3400
maaf kalau jawabannya salah, soalnya lupa kalau satuannya berbeda, yang penting rumusnya seperti itu??
l = 25 mm
t = 10 mm
jadi lp balok = 2 x ((pxl) + (pxt) + (txl))
= 2 x ((80x25) + (80x10) + (10x25))
= 2 x (2000 + 800 + 250)
= 2 x 3050
= 6100
b. p = 4 dm = 40 cm
l = 20 cm
t = 15 cm
jadi lp balok = = 2 x ((pxl) + (pxt) + (txl))
= 2 x ((40x20) + (40x15) + (15x20))
= 2 x (800 + 600 + 300)
= 2 x 1700
= 3400