tolong di jawab yaa no.20 secepatnya,pakai cara yaa

volume = s^3
64.000 = s^3
s = 64.000^(1/3)
s = 40cm

luas segitiga 1 =
a × t / 2 =
(1/2.40) × 40 / 2 =
20 × 40 / 2 =
400cm^2

luas segitiga 2 = luas segitiga 1 =
luas segitiga 2 = 400cm^2

panjang sisi sama pada
s√2 = 400 × 2 / 40
s√2 = 20
s = 20 / √2
s = 20.√2 / 2
s = 10√2 ( B )

#semoga membantu....