no 27 dan no,28.ya kak pliss pakai caranya ya

27) V = [( 24 × 9 :2)] × 54
= ( 12 × 9) × 54
= 109 × 54 = 5832 (a)
28) Luas permukaan kubus = 6 × ( r × r)
= 6 × ( 72×72)
= 6 × 5184
= 31104 (c)