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L = 2(p.l+l.t+p.t)
306 = 2(5x.2x+2x.1x+5x.1x)
306 = 2(10x²+2x²+5x²)
306 = 2(17x²)
306 = 34x²
x² = 306/34 = 9
x = √9 = 3
p= 5x3 = 15
l = 2x3 = 6
t = 1x3 = 3
V = p . l . t
V = 15 . 6 . 3
V = 270 cm³
1. (essay)
diagonal ruang = 6√3
jadi panjang sisi kubusnya= 6 cm, karena rumus diagonal ruang adalah a√3
V = a³
V = 6³ = 216 cm³
done (: