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80 = 4s
20 = s
LP = 2(La) + (Ka × t)
LP = 2(s²) + (4s × t)
2640 = 2(20²) + (4(20) × t)
2640 = 2(400) + (80 × t)
2640 = 800 + 80t
80t = 2640 - 800
80t = 1840
t = 23
Jadi tinggi prisma adalah 23 cm (B).
80=4xr
rusuk alas=20cm
luas alas+tutup=2xrxr=2x20x20=800
luas prisma=alas+tutup+4 sisi tegak
2640=800+4 sisi tegak
4 sisi tegak=1840cm
sisi tegak=460cm
tinggi=460/20=23cm (B)