Question

Panjang diagonal sisi suatu kubus adalah 4 cm.Volume kubus tersebut adalah..
A.8
B.8
C.16
D. 16
E. 64

Answer 1

Diagonal sisi = √s² + s²
= √2s²

√2s² = 4
√2s² = √16
2s² = 16
s² = 16 / 2
s² = 8
s = √8 cm
s = √4.√2 cm
s = 2√2 cm

volume = s³
= (2√2)³
= (4.2)(2√2)
= 8(2√2)
= 16√2 cm³

Answer 2

S² + s² = 4²
2s² = 16
s² = 8
s = 2√2

V= s³ = (2√2)³ = 16√2  (D)